Toby Roland-Jones: England seamer a doubt for 2017-18 Ashes
England seamer Toby Roland-Jones will miss Middlesex's final game of the season with a stress fracture in his lower back and is a major doubt for the Ashes tour of Australia.
Roland-Jones, 29, made his Test debut in the third Test against South Africa at The Oval in July.
He started Middlesex's 36-run County Championship win over Lancashire this week but did not finish the game.
Roland-Jones has taken 17 wickets in four Tests.
A Middlesex statement on Friday said: "The result of the medical scan has revealed Toby has a stress fracture in his L5 vertebra (lower back), which will mean he will take no further part in the domestic season for Middlesex."
England will name their Ashes squad at The Oval on Wednesday.
Middlesex's final game of the season is the County Championship fixture away to Somerset, which starts on 25 September.
The first Test of the five-match Ashes series starts on 23 November in Brisbane.