Fulham and Bolton are also said to be keen on the Switzerland international.
Portsmouth join interest for Man City's Gelson
Support Tribal Football with this great deal from our partners ExpressVPN. You get an extra three months free with the 12-month plan (a saving of 49%!). All plans come with a 30-day money-back guarantee if you change your mind. Click here to try now, risk-free for 30 days - and support Tribal Football in the process.
Video of the day: