In the Europa League match, Everton lost to Lyon on the road with a score of 0: 3 and lost the chance to leave the group.
Shortly before the break, Everton defender Kuko Martin entered the air fight for the ball, but failed to land and lost consciousness.
The medical staff spent seven minutes helping the 28-year-old defender of Curacao, after which he was taken off the field, fixing his neck with a corset.
"Kuko had a concussion and he complained of neck pains. He went straight to the hospital for X-rays and scanning, "said Everton coach David Answorth after the match.
Martina joined Everton last summer as a free agent and spent ten games for the "toffee" this season.