Former New York Giants wide receiver Mario Manningham agreed to terms with the 49ers Saturday night on a two-year deal, league sources have confirmed.The 49ers have yet to announce the signing until they receive the signed contract and it's approved by the NFL -- a mere formality. That is expected to occur Tuesday or Wednesday.In the meantime, Manningham has changed his Twitter name to @Manningham49ers.Manningham was one of the heroes in the Giants' Super Bowl title. His sensational 38-yard reception was a key play on the Giants' game-winning drive late in the fourth quarter of New York's 21-17 victory over the New England Patriots.On Monday, Manningham, who spent his first four seasons with the Giants after being a third-round draft pick in 2008, expressed his gratitude to New York fans:"I just want to thank ALL of @Giants Nation from my teammates I have played with to all my coaches throughout my years in NY... most importantly I want to thank all of the fans for being behind me and supporting me since draft day. I might be moving on to a different team but will never forget where I started in this league. Being a part of and helping bring another Super Bowl Championship to this great organization and city is something that will last with me forever. So once again THANK YOU!!"