The France international has concerns over the direction his career has taken since his £24m arrival from Southampton last year.
Schneiderlin has just five minutes of Premier League action under his belt this season and the 26-year-old has been left frustrated by just his two starts against Feyenoord in the Europa League and Northampton in the EFL Cup so far.
Schneiderlin missed out on last season's FA Cup Final win over Crystal Palace, and things haven't improved since the arrival of Jose Mourinho in the Red Devils' hot seat.
The former Saints man snubbed a move to Arsenal in preference of United and sources have told SiaS the player is already considering his future as he weighs up whether he should stay and fight for a first-team place or look to move on elsewhere.
A January exit looks unlikely but if the midfielder's situation has not improved come the end of the season, he is set to seek an Old Trafford exit next summer.