Cenk Tosun has cut short his loan to Crystal Palace and returned to Everton amid concerns he is facing six months out with a knee injury.
Tosun suffered the injury in training and fears he has ruptured knee ligaments but will be further assessed at Everton.
The 28-year old fears he will miss most of the year including Euro 2020 for Turkey.
Crystal Palace had agreed to sign the striker on loan until the end of the season and there was a £20million option to buy clause as part of his move.