Arsenal face Manchester United on Sunday in what could end up being a season-defining game for both sides. A win for Arsenal would allow the Gunners to keep the pressure on in the title race, while a loss for Manchester United would likely mean that the Red Devils won’t be playing European football next season for the first time in a long time. Both sides will be desperate to win this one, but with Arsenal sitting top of the table and United struggling in eighth, it’s not hard to fancy the Gunners heading into this one. Speaking in Stick to Football, Roy Keane has made his prediction for this …