Manchester United interim coach Ralf Rangnick was critical of the refereeing during Wednesday's loss to Atletico Madrid.
The Spanish side pulled off a 1-0 victory at Old Trafford on Tuesday to reach the Champions League quarter-finals.
"I think we played a very good first half - exactly the way we wanted to play with a high energy level but we couldn't convert that into one or two goals," Rangnick told BT Sport.
"We had a few good moments where we should have scored but we didn't. Conceding that counter-attacking goal just before half-time didn't make life any easier.
"It was hard in the second half and always interupted. There was always somebody lying on the floor. I would also say some curious refereeing decisions. I wouldn't say they were decisive but at least he fell too often for those time-wasting antics and four minutes at the end added on was a joke for me."
He added: "That was a foul for sure on Anthony Elanga but the referee and the linesman didn't see it that way. For me that was the only real moment, and the offside goal, that they scored with. Apart from that, we defended well and we were compact in their transition moments. There is nothing I can blame the team for in the first half."
