Brett Lee's ability to thrive in English conditions has been questioned by his former Australia team-mate Jason Gillespie.
Lee, 32, is making his third Ashes tour this summer after overcoming an ankle injury but his Test record in England is modest.
The New South Wales paceman averages 45.44 per wicket in 10 Tests in England, compared to a career mark of 30.81.
Gillespie, who toured with Lee in 2001 and 2005, believes his former strike partner needs to adapt his bowling to the slower pitches.
"There's no fitness issues with Brett," Gillespie told The Australian.
"Brett's got to learn to master English conditions. That's going to be his biggest challenge, not so much his fitness.
"It's going to be the slower wickets so his pace doesn't have the same impact.
"He's not bowling as fast anymore. We know that."
Lee, who has taken 310 wickets in 76 Tests, is far from certain to make Australia's starting XI for the Ashes opener in Cardiff from July 8-12.
He took four wickets in the tour match against Sussex but failed to strike in either of his opening spells, and delivered an incredible 14 no-balls.
Mitchell Johnson will lead the tourists' seam attack in Cardiff alongside two, possibly three, of Stuart Clark, Ben Hilfenhaus, Lee, and Peter Siddle.