Crystal Palace want to sign Arsenal defender Calum Chambers.

The 22-year old, who spent last season on loan with Middlesbrough, is valued at £20m, according to Sky Sports.

Chambers was left out of Arsenal's pre-season tour of Australia and China because of his participation in the U21 European Championships.

The versatile defender was signed for £16m from Southampton three years ago, but has struggled to tie down a regular spot in Arsene Wenger's starting XI.

Palace boss Frank de Boer is looking for his first permanent signing of the summer, after having only secured Chelsea midfielder Ruben Loftus-Cheek on loan.