FC Zurich are to launch a criminal case for assault against FC Aarau player Sandro Wieser for his tackle on Gilles Yapi-Yapo last weekend.

The midfielder's knee was badly damaged and the Swiss club said they were uncertain he would ever play again.

"Our club lawyer is preparing everything for the prosecution which will be submitted to the court," an FC Zurich spokesman told BBC Sport.

FC Aarau have been contacted by the BBC but have yet to respond.

However, Liechtenstein international Wieser, 21, has reacted to the incident on the club website,  expressing his regret.

"I want to apologise to Gilles Yapi and FC Zurich for the foul," said the midfielder, who was sent off for the tackle.

"It was never my intention to hurt Gilles. It is difficult to explain in retrospect what happened on the field in a fraction of a second."

The incident occurred during the first half of Sunday's Swiss Super League match at FC Aarau's Stadion Brugglifeld.

Both players chased the loose ball, but Wieser arrived late and caught Yapi-Yapo on the side of his knee. The former Ivory Coast international was taken off on a stretcher.

FC 취리히와 FC 아라우와의 경기에서 나온 반칙

 반칙을 당한 야피 야포 선수는 

무릎 전방 * 후방 십자인대, 반월판, 슬개건까지 모두 파열....

선수 생활은 아작났고,  일반 생활까지 영구 장애인 될수도 있는 수준

말 그대로 오른쪽 무릎 전체가 걸레짝이됬습니다..

FC 취리히 구단 측에선 이 문제를 절대 넘어가지 않고 형사고소까지 할 예정

반전은 두 선수가 현 소속팀전에 FC 바젤에서 한솥밥을 먹던 이미 구면인 선수들이라는군요.

옛동료 인생 송두리째 말아버렸습니다.