Tigres and Santos Laguna faced at the Estadio Universitario in Mexico. Felix Torres cleared a ball that Andre-Pierre Gignac tried to dodge by turning his head, but it hit him in the back of the neck and caused a second-degree neck injury.
Gignac fell to the ground and tried to get back to his feet after medical assistance, but the blow caused him to retch and vomit. As a result, the player fainted and was substituted.
The striker was quickly taken to hospital for "precautionary tests", as Tigres coach Diego Cocca confirmed after the match, which ended 1-1.
"He went for tests as a precaution, especially because it was a ball. He felt like he wanted to vomit on the bench and it worried us all, but these are normal symptoms," the manager said.