On Wednesday, the 49ers opted to place Morgan on injured reserve, ending his 2011 season.
Morgan has 220 yards receiving and one touchdown this year. He's a solid blocking receiver, which could affect Frank Gore and the 49ers running game (which is really the strength of their team).
The 49ers signed Brett Swain in place of Morgan and they'll rely on Vernon Davis and Delanie Walker at tight end a little more, along with Ted Ginn out wide.
Check out SB Nation's Niners Nation for the impact of Morgan's loss.