Mane better not break his promise to this young Saints fan.
Footballers are a proper fickle lot, one minute they're staying, the next minute they're off to some fancy Dan team who can buy them nice things.
The Sengalese winger has been tipped to be making the switch to Old Trafford after Ed Woodward's wheeling and dealing for Barcelona's Pedro didn't quite go to plan.
However, before Southampton's Europa League clash with FC Midtjylland a young fan asked Mane to promise to stay, and Mane agreed. Great right?
Well, lets take you back to last summer when Chelsea were looking to snap up Queens Park Rangers' Loic Remy to sit on the bench for them. On August the 20th, a young QPR fan urged Remy not to leave Loftus Road and the Frenchman agreed... 11 days later Remy signed for Chelsea.
So we're sorry to break this to you Southampton fans, but it's not looking so good for you keeping hold Mane but then again, Ed Woodward's track record isn't so hot this summer...