Swansea City manager Michael Laudrup was angry at the referees decision to not stop play when Michu was floored in their 1-0 loss at Tottenham on Sunday.
The Spaniard was felled by Spurs keeper Hugo Lloris in an aerial challenge late in the White Hart Lane fixture but referee Mike Dean did not stop play as the home side almost added a second after Jan Vertonghen's 75th minute opener.
"Fortunately he is OK," Laudrup said. "When I saw it I thought 'Oh hell, he is unconscious, you can't fake a reaction like that' - it isn't like when someone kicks you, this is completely different.
"I was very angry and it wasn't because I wasn't a free-kick or a red card for Lloris or a penalty or whatever but we always talk about people, there is a debate, should we kick the ball out.
"It is the same debate in every country - we have a referee and two linesmen so we just go on until the referee blows the whistle.
"But with possible head injuries, like this one, there is no doubt, you have all the linesmen and the referee and they are connected.
"I watched it afterward on the television and when it happened, when Michu is going down to the ground the referee is watching them, the linesman is watching them and still they let the game go on, it is such a poor decision and dangerous as well."