The Switzerland midfielder completed a move to Arsenal before Euro 2016.
Paul Lambert has been instilled as one of the favourites to take over at Celtic.
The German international defender would be a fantastic signing for Liverpool.
The one-time Liverpool defender has questioned the motives behind Xherdan Shaqiri's recent Stoke City move.
Liverpool must start hard and fast against FC Basel, not allowing their opponents time on the ball, according to an ex-pro.
Former Liverpool defender Stephane Henchoz says the club have failed to replace Jamie Carragher.