Doncaster prop forward Ian Williams has died after he collapsed at training, the Greene King IPA Championship club have announced.

Prop forward Ian Williams, 27, who joined the Knights from neighbours Rotherham last summer, collapsed during a session at Castle Park and could not be resuscitated.

Williams, an Oxford graduate, made six appearances for his club, who said in a statement: “It is with great sadness that Doncaster RFC announces the passing of prop forward Ian Williams.

“Ian collapsed at training at Castle Park this morning and, despite the best efforts of the emergency response team, could not be resuscitated.

“We extend our deepest sympathies to Ian’s mother Pippa, father Phillip and and sister Helen and are working with a counselling team in the best interest of Ian’s team-mates.

“The club will be making no further comment at this time.”

Williams’ former club Rotherham led the tributes to the prop forward.

In a statement posted on Twitter, the club said: “@RotherhamRugby are deeply saddened to hear the tragic news that former prop forward Ian Williams has passed away. As a Club we pass on our deepest sympathies to Ian’s family & close friends #RugbyFamily”

England forward Joe Marler expressed his sympathies: “Thoughts are with everyone @DoncasterKnight and the family and friends of Ian Williams.”

Aviva Premiership side Harlequins said on their official account: “The thoughts and condolences of everyone at Harlequins go out to the family and friends of Ian Williams and all at @DoncasterKnight”

Gloucester fly-half Billy Burns tweeted: “Thoughts are with everyone at @DoncasterKnight and the family and friends of Ian Williams. Tragic news.”

London Irish wing Alex Lewington said: “Deepest sympathies go out to everyone at @DoncasterKnight and anyone close to Ian Williams on this terrible day.”

Ospreys, the Greene King IPA Championship account and the Rugby Players’ Association also expressed their condolences.