Borussia Monchengladbach's director of sport Max Eberl has admitted midfielder Granit Xhaka could leave the club if a tempting offer is received, according to dailymail.
The Switzerland midfielder has attracted interest from a host of clubs, with Bayern Munich, Arsenal and Liverpool reportedly among the admirers - but he still has three and a half years left to run on his contract in Monchengladbach.
'It depends a bit on our own sporting success, it depends on Granit's own performances and of course it depends on the figures,' Eberl told WDR 2 radio.
'If they reach a certain dimension, then you could get dizzy. There are always situations in which every club would have to make considerations.'
Eberl says Gladbach do not have to sell, however, and he hopes such a bid does not arrive.
'It is all in our own hands,' he said. 'As things stand, we are happy to have him with us and hopefully he will stay with us for a long time.'
Xhaka has scored three goals in 15 games for the Foals this season and recently became their captain.