The former Liverpool and Aston Villa player has embarked on a three-week fitness programme in Tenerife.

"I've had physical tests and I'm confident I will come back faster, stronger and fitter than I ever was," Collymore told the Daily Mirror.

"A month from today I guarantee I will be able to stand side by side with any striker in the country and my physique will be up there with any of them.

"This time I'm not going to self-destruct. You are not going to see headlines about me being kicked out of a bar somewhere in the early hours rolling drunk."

The 35-year-old added: "I know I can still be among the best."

Collymore last played professional football for Real Oviedo in Spain's Primera Liga in 2001.

Since then he has tried to forge a career as an actor, appearing in Basic Instinct 2.