Celtic have been linked with Jelle Vossen and Saidy Janko but assistant coach John Collins has refused to comment on the speculations.

Vossen plays as a striker for Belgian side KRC Genk while 19-year old Swiss right-back Janko is currently contracted with Manchester United.

Collins said: "There are lots of players we have been mentioned with. That is always going to be the case. We want to strengthen.

"It's not fair for me to talk about individuals at clubs. That would be disrespectful to their managers – and the players. But we're on the look-out."