MANCHESTER - France international midfielder Morgan Schneiderlin became Manchester United manager Louis van Gaal's fourth signing of the close season when he joined Manchester United from English Premier League rivals Southampton on Monday. The 25-year-old -- who joined Southampton from French side Strasbourg for just 1.5million euros (£1.2million) in 2008 -- signed a four year contract with United. Schneiderlin has long been linked with a move to Old Trafford and it had been reported United had a bid in the region of £20 million ($31.2 million, 28 million euros) rejected up to two weeks ago.