Mercedes' Lewis Hamilton has pulled out of this week's Pirelli tyre test in Barcelona due to a sore foot.
The reigning world champion had been scheduled to participate in his first mid-season test event since 2014, but the problem has forced him to withdraw, with team-mate and Drivers' championship leader Nico Rosberg taking his place at Circuit de Catalunya during the opening day of the event on Wednesday.
A Mercedes spokesman confirmed the reason behind Hamilton's absence, although there are no concerns over whether the Brit will be fit enough to participate at next week's United States Grand Prix in Austin.
"Lewis had some discomfort in his foot after training on Tuesday," a Mercedes spokesman told Reuters. "It was agreed he wouldn't test so he could rest it and get physio to be in good shape for Austin, which he will be. No concerns on that front."
The 31-year-old is currently 33 points behind Rosberg in the world championship standings, with just four races still to go in the season, although the Brit will fancy his chances of reducing that gap at Circuit of the Americas, as he has claimed victory at the venue in three of the last four years.