One of the reasons why the San Francisco 49ers were investigating free agent receivers in recent days is that one of their last gets at the position didn't work out.Now, Mario Manningham will try to revive his career with his original team. ESPN's Adam Schefter reported Manningham signed a one-year deal with the Giants. After being a Super Bowl hero for the Giants, Manningham signed a two-year deal with the 49ers in 2012.He was fairly effective in his first season with the 49ers.