The 29-year-old was struck by a throw-down from former international Marcus Trescothick, who is working with the team in a temporary capacity, during practice on Tuesday.

Roy was assessed after impact and was able to continue batting, but also required a follow-up check on the eve of the match to determine any delayed symptoms.

Roy will undergo a further check on the morning of the match, the England and Wales Cricket Board indicated, but is now expected to take his place at the top of the innings on Thursday.

The issue of head injuries has become a major talking point in the series after Australia star Steve Smith was struck in the neck by a bouncer from Jofra Archer at Lord's.

He was subsequently diagnosed with delayed onset concussion, becoming the first Test cricketer to be substituted for concussion, and has also been ruled out of this week's match.

Roy was not the only player to be hit on the helmet on Tuesday as both sides build their readiness against the short ball, with Marnus Labuschagne - Smith's replacement in the last match - struck by teammate Mitchell Marsh.

Australian Associated Press