The Sunday Mirror says the 25-year-old has 18 months left on his contract at Vicarage Road, but Watford may be tempted by an offer of around £2m.
Swans boss Brendan Rodgers may move for him in the January window.
Tribal Football Staff are dedicated to the football tribes from all over the world. Our team is passionate about delivering football news to our hundreds of thousands of followers in all the corners of the globe. Football is life, It never stops, Neither do we.