Stoke City goalkeeper Jack Butland is undergoing a medical with Crystal Palace ahead of a permanent deadline-day move, Football Insider understands.

The 27-year-old shot-stopper has been given the green light to leave by the Championship side after falling behind Adam Davies in the first-team pecking order.

A recruitment source has told Football Insider that Palace have agreed a fee of £900,000 rising to a potential £2m for the England international and that he will put pen to paper on a three-year deal at Selhurst Park.

Butland, who joined Stoke from Birmingham City back in 2013, has endured a shaky couple of seasons between the sticks which has seen him drop out of both the England setup and the Potters’ starting XI.

He was dropped by former boss Nathan Jones in October last season and spent five games on the bench before he returned to the side.

However, he was left out once again for the final four games of the 2019/20 campaign and has remained on the substitutes’ bench for the opening fixtures of the new season.

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With Davies and young keeper Blondy Nna Noukeu also at his disposal, Stoke boss Michael O’Neill has given Butland the green light to leave as the club look to offload his wages before today’s 5pm deadline.

The nine-cap England international is set to join Palace subject to a medical and will become the fourth senior shot-stopper at the club.

The Eagles already have first-choice keeper Vicente Guaita, Wales international Wayne Hennessey and the experienced Stephen Henderson on their books.

In other Crystal Palace news, Derby County have set their sights on a last-minute raid at Selhurst Park.