Swansea have confirmed that Gylfi Sigurdsson will not travel with the squad for the preseason tour of the U.S. due to uncertainty over his future.
Everton are reportedly interested in signing the Iceland international despite Swansea trying to ward off any interest by putting a £50 million price tag on a player who scored nine goals and assisted a further 13 as the club narrowly avoided relegation.
Swansea said on Twitter: "We can confirm that Gylfi Sigurdsson will not travel with the squad for our pre-season tour of the USA.
"Having played v Barnet last night, Gylfi did not feel in the right frame of mind to travel due to the current uncertainty over his future."
Speaking after the preseason friendly defeat to Barnet, in which Sigurdsson captained the side in the second-half, boss Paul Clement said the club wanted to keep their star man but may be forced to sell in the event of "a really good offer" or the player becoming distracted by speculation.
"I've made it very clear I want him to stay here," Clement said. "The fans want that, the owners would like that but, ultimately, there's a business side to football as well.
"We had that situation with Jack Cork [who joined Burnley on Tuesday]. In the summer there was no thought of moving Jack on but it got to a point when another club came in with a really good offer. That might end up being the case with Gylfi. We don't know yet.
"You don't want to be in a situation where it's dragging on through July and all through August, when the season's started, with the situation not being resolved. The sooner the better.
"I don't know how people are going to behave in the future. I know the kind of character I worked with last year -- someone who's very professional.
"He's come back, he's got his head down and he's doing his work, so I hope that continues. He's one of our most valuable players. He showed that last season with his goals and his assists, and he was instrumental in us maintaining our Premier League status."