Lando Norris is being checked over by a McLaren team doctor after finishing eighth at the Spanish Grand Prix.
The Briton has been unwell across the weekend, in particular, looking visibly out-of-sorts in the FIA's pre-race press conference on Friday.
But after fighting his way to points in the searing heat at the Circuit de Barcelona-Catalunya, McLaren confirmed Norris was being attended to by the medical team.
"Lando, unfortunately, won’t be attending the post-race media pen as he is being checked by our team doctor," read a team statement.
"He has been feeling unwell throughout the weekend and while cleared to race, with the extraordinary heat today, the team are now ensuring he is receiving a full health check."
It is understood Norris has been tested regularly for Covid-19 with negative returns throughout the weekend, yet symptoms of fever and headaches have been showing, with the suggestion being he has tonsilitis.
Norris' symptoms were not aided by the 37-degree Celsius heat at Montmélo, with his issues reminiscent of Lewis Hamilton's struggles post-Hungarian Grand Prix last season.