Swansea manager Paul Clement claimed Manchester United's Marcus Rashford "deceived" referee Neil Swarbrick to earn a penalty at Old Trafford.
Wayne Rooney scored from the spot on the stroke of half time only for Gylfi Sigurdsson to equalise superbly.
The result leaves Swansea two points adrift of safety and Clement convinced Rashford dived for the penalty.
"Having seen it again the player deceives the referee. It's clear," Clement said.
"It's not even falling into the challenge. The fall is before the tackle so the referee was deceived."
Rashford went down under a challenge from Swansea goalkeeper Lukasz Fabianski just before half-time, with Clement pointing the finger at the player rather than referee Swarbrick.