He argued that the pivotal penalty allowing Bruno Fernandes to equalise was wrongly awarded, claiming the foul occurred outside the box.
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Glasner also suggested referee Chris Kavanagh gave the hosts an “Old Trafford bonus,” helping them secure the win.
The controversy centred on Maxence Lacroix’s straight red card for a last-man foul on Matheus Cunha, which led to the penalty.
"The red card changed the game completely," Glasner told the media.
"I think it's a very hard decision. The foul starts outside the box. Cunha is very smart to wait until he is inside the box and fall down."