Ralf Rangnick questioned the refereeing and VAR over four decisions during Manchester United's 3-1 defeat at Arsenal.
United were denied a penalty when Cedric Soares handled inside the area with Arsenal 1-0 up and Cristiano Ronaldo was denied a second goal for offside at 2-1. Rangnick suggested the offside line was not conclusive to find Ronaldo offside.
Rangnick also noted Eddie Nketiah was in an offside position when he was directly in David de Gea's eyeline when Granit Xhaka struck the clincher in the 70th minute.
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United were awarded a penalty with Arsenal 2-1 up in the 57th minute but Bruno Fernandes hit the post.
"There was another handball issue in the first-half, Jadon Sancho was involved," Rangnick said. "The second goal of Cristiano was not offside and you can even see it in that total perspective exactly in one line. I just saw it right now after the game and if this is the right picture, and I suppose they showed me the right picture, you could see it. It was clearly one line in one line.
"Their third goal was clearly offside, I spoke to David de Gea after the game and he said to me he just couldn't see the ball because Nketiah was in between Granit Xhaka and himself. They checked it but for whatever reason still gave the goal.
"Anthony Elanga was arm-in-arm with [Tavares], the other player with him. At least, also questionable. The other three situations were clear. This is why we have a VAR and you should expect the VAR plus the referee, if they're checking situations they come to the right decision.
"We were at least unlucky with those three or four moments but, again, we have to just get better defending in the box and until five or six weeks ago we were on a higher level. And even in the pressing moments, whenever we pressed Arsenal today we caused problems to them.
"But we did not do that often enough, we should do that more often, with more intensity, with more players involved. If all of the players sprint against the ball it has a higher effect than it had today."
