Australia’s Smith was withdrawn on day five of the second Test after showing delayed symptoms from the 92mph Jofra Archer bouncer that struck him in the neck the previous afternoon.
The 30-year-old, who has scored 144, 142 and 92 in his three innings to date, was present at Australia’s training session in Leeds on Tuesday but did not take any active part in proceedings.
Smith retired hurt after being floored by the Archer delivery but returned to complete his innings after less than an hour off the field.
He gave an unsteady performance, uncharacteristically missing a straight ball to fall lbw then calling for a review at the same time as walking to the pavilion.
At the time he had passed all necessary concussion testing but his condition deteriorated overnight and Marnus Labuschagne duly became Test cricket’s first concussion substitute.
Smith declared his intention to play at Headingley provided he was passed fit by medics but given most guidelines on return-to-play protocols that always seemed unlikely.
Provided by Press Association Sport
Day four of the second Ashes Test ended firmly in the balance, England 104 ahead with six second-innings wickets in hand heading into a finely-poised final day. But there was one huge talking point out of so many after an exhilarating afternoon duel between England’s debutant Jofra Archer and Steve Smith.
Smith was led from the field but returned just 40 minutes later after passing concussion tests, dismissed softly by Chris Woakes for 92 and looking understandably shaken.
Australia eventually wrapped up eight behind on 250, and England – at 9-2 for one point – fought back to set up a tantalising day five, with Ben Stokes (16*) and Jos Buttler (10) at the crease and the hosts leading by 104 runs.
Keep up to date with all the day’s play at Lord’s via our live score.
Welcome to live coverage of day five of a captivating first Ashes Test at Edgbaston.
Steve Smith’s majestic double tons on his return to Test cricket leave England scrapping to salvage a result on the final day.
Smith, back in the Baggy Green 16 months after being banned for his role in the sandpaper scandal, followed a brilliant 144 on day one with an equally fine 142 on day four to become just the fifth Australian to hit twin hundreds against England.
Where the first rescued his side from the cliff edge at 122-8, the sequel helped set a monstrous target of 398. Matthew Wade also left his mark on the home team, chiming in with a fluent 110 before the declaration came at 487-7.
The most realistic task for England appears to be to try and bat right through for a draw, with first-innings centurion Rory Burns and Jason Roy successfully navigating seven overs before stumps on Sunday.
Can England survive? Or will Nathan Lyon et al bowl Australia to victory?
The hosts resume on 13-0, needing a nominal 385 more runs to win.