Mike Catt says he could miss England's tour of South Africa because of a back injury, potentially handing coach Brian Ashton another selection headache.
Catt says he has to make the right decision for himself and England
Ashton must already do without 29 players involved in European finals, with Catt his likely captain if fit.
"I haven't been able to play for five or six weeks because of my back and I will speak to Brian about the right thing to do," said the 35-year-old.
"A few decisions have to be made and I need to see where I am physically."
Catt, who led England in their final two Six Nations games against France and Wales, misses London Irish's final Premiership game of the season against Northampton on Saturday.
The England squad, which will be named on Tuesday, leave for South Africa on 15 May.
They will play two Tests against the Springboks, in Bloemfontein on 26 May and Pretoria on 2 June.
For South African-born Catt, the games have an added appeal.
"From a purely selfish point of view, the chance to captain England in South Africa would be brilliant," he added.
"The Tests are going to be a massive challenge and they are a huge opportunity for those players who are chosen to tour."