SANTA CLARA, Calif. -- The San Francisco 49ers have had to remake their inexperienced receiving group on the fly this summer.After losing projected contributors Bruce Ellington and Eric Rogers to season-ending injuries during training camp, the Niners made two late deals to acquire Jeremy Kerley and Rod Streater to bring in some needed experience to go along with Torrey Smith.Before those trades, Smith was the only receiver on the 49ers roster who had more than 30 catches in a single season. With coach Chip Kelly often using at least three receivers at a time and running an up-tempo offense that requires a rotation at the position, it was paramount to add some help before the start of the season next Monday against the Los Angeles Rams.These guys going to have to play -- like right away, Smith said Wednesday. They have their work cut out for them this week, but we know they have the talent to get it done.They join a group that also includes starter Quinton Patton and rookie Aaron Burbridge. But neither of those players has had as much production in their careers as Kerley and Streater have.Kerley was acquired from Detroit to play the slot position after Ellington was placed on season-ending injured reserve with a hamstring injury.Kerley has had success in that role in the past during his time with the New York Jets. He caught a career-high 56 passes for 827 yards in 2012 and had 43 catches the following year before his production started to taper off.We lost Bruce and we kind of replaced him with a guy that has similar traits, offensive coordinator Curtis Modkins said. I think Jeremys going to be very productive for us. Im happy hes here.Streater also has not put up big numbers in recent years, but the Niners hope he can revive his career and fill the void created on the outside when Rogers went down with a knee injury. The Niners had big plans for Rogers this season after signing him out of the CFL but had to adjust when he got hurt in a non-contact special teams drill early in camp.Streater, a former undrafted free agent, caught 60 passes for 888 yards in his second NFL season with the Oakland Raiders in 2013. He played just three games the following year before breaking his foot and was relegated to inactive duty most of last season when he played just one game and caught only one pass.I like what Rod brings, Modkins said. One, he has some length. He can run. Hes had some production in this league and you know, when we lost Eric, we felt like Eric would kind of give us some of that downfield, a bigger guy that can move. I think Streater kind of replaces that.Streater signed in the offseason with Kansas City before being acquired by San Francisco on Saturday prior to roster cuts. He arrived in the Bay Area on Sunday and immediately started putting in long days to learn the offense and to improve his conditioning for Kellys fast-paced offense.He likes guys who can play inside and outside, with speed and you have to be smart, Streater said. I feel like I learn the plays very fast. I play inside and outside. Thats whats most important, learning the plays and being interchangeable.Game notesRB Carlos Hyde practiced for the first time since suffering a concussion on Aug. 26 in a preseason game. He wore a blue non-contact jersey but is ready to play. Im good to go, he said. ... DL Glenn Dorsey has not participated in full practices after tearing his right ACL last November. 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Clarkson had been dealing with an elbow injury in early January and will be out of action for at least one week. He has three goals and five assists through 36 games with the Leafs this season.There was just a bit of uncertainty heading into Tuesdays opening leg of Major League Soccers all-Canadian Eastern Conference championship.The Montreal Impact and Toronto FC are due to meet Tuesday night at historic Olympic Stadium, a 40-year-old Montreal landmark built for the 1976 Olympics.Even though its an indoor venue, a concern going into the match was the weather: The stadium roof is fragile -- and snow was falling in the city Monday. But a stadium heating system appeared to be keeping any accumulation at bay and the Olympic Park announced the game would go on as planned.The Impact normally play at Stade Saputo, which sits next door to the Olympic Stadium but seats just over 20,000. Nearly 60,000 are expected for the match.The Impact has played games at the Big O, so the home-field advantage is still there, but the condition of the artificial turf -- which lies atop concrete -- might be a factor. Saputos surface is natural grass.As far as the surface, of course, we would like to get to this point to such important games and playing the best possible conditions, but thats just one factor among many others in the game, Toronto star Sebastian Giovinco said.Some of those other factors to consider for the two-legged MLS conference finals:TORONTO VERSES MONTREALMontreal finished 11-11-12 in the regular season for the fifth seed in the East. The Impact defeated the New York Red Bulls 3-1 on aggregate in the conference semifinals to advance. Theyre led by Argentinian midfielder Ignacio Piatti, who scored 17 goals in the regular season and three in the playoffs.The Impact appear to have gotten past the controversy involving former Chelsea star Didier Drogba, who lost his role as a starter to Matteo Mancosu. Drogba sat out of Montreals second-to-last regular season match against Toronto, a 2-2 draw, because of the demotion. But he told reporters last week that he was focused on taking the Impact to the MLS Cup championship.Toronto was the No. 3 seed in the East after going 14-9-11 in the regular season. TFC advanced to the conference finals with a 7-0 aggregate victory over New York City FC. The team is led by Giovinco, who has 21 total goals this season, including four in the postseason.The Impact defeated Toronto in the knockout round of the playoffs last year.Last year was just a small taste, Toronto FC coach Greg Vanney said last week in a conference call with reporters. We started extremely poorly in that game and paid for that, but I think it was just a taste of the rivalry continuing to build between these two franchises.dddddddddddd Its a Montreal-Toronto rivalry in hockey and other sports that goes way, way back. We have enough guys on the roster from last year who remember that day and were embarrassed on that day, as was myself, but our mentality will be different than it was last year.COLORADO VERSUS SEATTLEThe Sounders went 14-14-6 during the regular season for the No. 4 seed in the Western Conference. Seattles story is the teams incredible rebound from last place in the conference and the dismissal of longtime coach Sigi Schmid. The interim tag was removed from coach Brian Schmetzers title earlier this month. The Sounders, who defeated FC Dallas 4-2 on aggregate in the semifinals, are led by homegrown rookie Jordan Morris with 12 overall goals.Colorado, which finished 15-6-13 in the regular season and narrowly missed out on the Supporters Shield, got a knockout-round bye as the second seed in the West. Known more for their stout defense, the Rapids are led by Swiss forward Shkelzen Gashi with 10 goals in his first MLS season. The Rapids advanced after a penalty shootout with the Los Angeles Galaxy following a 1-1 semifinal.Colorado won the MLS Cup in 2010.Both teams have been stung by injuries this season. For the Sounders it was the unexpected loss of national team star Clint Dempsey because of a heart issue.For the Rapids it has been the loss of goalkeeper Tim Howard, who had season-ending surgery Thursday after suffering a fracture of the right adductor longus in his groin while on duty with the U.S. national team.Colorado will start Zac McMath, who lost the job when Howard joined the Rapids in July after 10 seasons with Everton in the English Premier League. McMath was one of the best goalkeepers in the league at 9-2-5 when Howard arrived.Credit to Zac for being very strong mentally, and prepared, Rapids coach Pablo Mastroeni said. It takes a man to be able to take that information, given his performances, and not sulk and not throw his toy and not run out of the room and slam doors, to look at someone in the face and go, `OK, this is your decision, all right. Im a team player; Ive got to respect that. ' ' '