• Swansea insist they will not be bullied into dropping £50m asking price• Welsh club say any Everton agreement with player would be illegal

Swansea City have questioned whether Everton have tapped up Gylfi Sigurdsson and warned they will not be bullied into dropping their £50m asking price for the Iceland international.

Sigurdsson stunned Swansea officials and coaching staff on Thursday when he pulled out of the club’s pre-season tour of the United States shortly before the flight to Philadelphia. The 27-year-old was apparently “not in the right frame of mind” amid continued interest from Everton, who want the midfielder as part of their summer spending spree.