FC Zurich are taking legal action after midfielder Gilles Yapi-Yapo suffered serious injuries in a challenge by Aarau player Sandro Wieser last weekend, The Guardian has reported.
The challenge, which happened during a Swiss Super League game, saw Wieser appear to stamp down on Yapi-Yapo's right knee.
Former Ivory Coast international Yapi-Yapo, 32, was carried off on a stretcher, and Zurich said he had suffered torn anterior and interior cruciate ligaments, serious cartilage damage, a meniscus tear, a torn kneecap and deep bruising in his thigh.
Zurich president Ancillo Canepa said the club would lodge legal proceedings for intentional injury against Wieser, who had been a teammate of Yapi-Yapo at FC Basel.
Wieser, a Liechtenstein international, apologised in a Facebook message that read: "I totally regret what happened. There was absolutely no intent on my part. I've had a lot of experience with injury, and I don't wish that on anyone."