The Dutchman admits United's interest was 'flattering' in the summer but he couldn't accept a move for one key reason.
The likes of Angel Di Maria, Luke Shaw, Radamel Falcao, Daley Blind and Marcos Rojo were not put off by United's absence from European's elite after finishing well outside of the Premier League's top four last season.
But Wesley Sneijder was.
Indeed, the Dutchman has claimed that he was aware of interest from boss Louis van Gaal, who he has described as 'one of the most intelligent men in football.'
His decision, however, was to reject Man United. Why? Because he is A) very happy in Turkey and B) because of Champions League football...
"Louis is one of the most intelligent men in football - and I knew of Manchester United's interest in the summer," Sneijder told reporters ahead of Arsenal's Champions League clash with Galatasaray.
Crucially, however, he admitted: "It was flattering - but I am very happy in Turkey - and it is very hard to leave Champions League football."
Sneijder's Galatasaray side have traveled to London to face Arsenal in the Champions League tonight, serving up the ultimate reminder of why a move to Old Trafford, in his own words, did not appeal to him.
Domestically, meanwhile, the Turkish side are fourth in their league, three points off early pace-setters Akhisar Belediye after four games.
By contrast, a mixed start has seen United falter in their first few Premier League games. But two wins in their last three have moved them up to seventh.