The Daily Star says Fergie was seething after Turkish ref Cuneyt Cakir killed off his Treble dream with a ridiculous red card for Nani.
He confronted the fourth official as his players surrounded the ref in disbelief after the Portuguese winger was given his marching orders for a raised boot in the 57th minute.
That came after United players had surrounded the referee at the final whistle, with Rio Ferdinand sarcastically applauding in his face.
The United boss refused to attend the mandatory postmatch press conference, which will land him in hot water with UEFA.
Mou the peacemaker? What do you think Fergie would've said? Give us your shout below...