Fabregas has struggled to hold down a regular starting spot at Camp Nou and may be tempted by the possibility of returning to the Premier League, where he thrived with Arsenal.
The Spanish international midfielder could certainly add to United's attacking options. With Neymar having arrived at Barcelona, he may also feel it's time to move on or risk spending a season waiting in the wings.
That said, would Barca really want to offload a player of his undoubted quality? Also worth considering is the fact Arsenal have first refusal on Fabregas, according to the terms of his contact.
In this clip, B/R's Will Tidey breaks down the rumour.