Cooper a doubt with hamstring injury

Kerry ace attacker Colm Cooper is an injury doubt ahead of the Kingdom's All-Ireland semi-final clash with Derry in Croke Park on Sunday week.

The forward picked up a hamstring injury in Kerry's win over the Dubs last weekend, but remained on the field as Kerry had used five substitutes.

The Dr Crokes clubman was Kerry's most influential forward as they overcame the Metropolitans.

He was named in the team to play Cork in the Munster U21 football final last night, but Dan Doona came in instead of him, and Cooper wasn't even listed among the substitutes.

It is thought he won't be back in training until next week at the earliest.