The likes of United, Chelsea, and Brighton could all make a move for him this summer.
Speaking to Sky Sports after winning the LMA Manager of the Year award for securing promotion to the Premier League, the 38-year-old said: "The club's got such a positive season and such a bright future ahead. We've achieved so much, it's been an incredible two years, and when you have those two years there's always speculation and things like that, there's been that every summer.
"But I know how much everyone's looking forward to the season, I know the club's in a fantastic path and everyone's just really looking forward to the season ahead. When you do well as a manager or as a player there's always going to be speculation, and I know what we've achieved isn't an ordinary thing, so of course there's going to be speculation then.
"But that's not where my focus is, to be honest. Tonight it's about what we've achieved last season, what we've achieved over the last couple of seasons, not just myself but everyone at the football club."