Jon Super/Associated Press
From apparently being ready to leave the club in August 2013, per The Guardian, Wayne Rooney has become an integral part of David Moyes' Manchester United. With 15 goals and 14 assists in the 2013/14 season so far, per Whoscored.com, and another goal-of-the-season contender under his belt, Rooney has made a key contribution.
Perhaps even more significantly, he has signed a £300,000-per-week contract, per BBC Sport. Given the value of that contract, isolating the player is not a realistic option.
Would it be possible for the two men to repair their relationship? In October 2013, Sir Alex told Geoff Shreeves of Sky Sports that Rooney was angry Ferguson had suggested he had made a transfer request, but that he had, in fact, made a verbal request to leave.
Subsequently, Rooney dismissed Sir Alex's claims that he was suffering from a lack of fitness last season, per Sky Sports.
Rooney also said, per the Daily Mail, again in October 2013, that he had been unhappy last season due to being played out of position.
These are only the public statements. It does not take an enormous leap of imagination to infer that things between the two men had reached breaking point.
If Sir Alex were to return, would he swallow his pride and find a way to work with the resurgent Rooney, or would he deem him surplus to requirements and try to find a buyer? Given his history, the latter seems more likely.
Either way, resolving the Rooney situation should be at the top of Sir Alex's to-do list.