Lando Norris was feeling under the weather on Thursday in Sao Paulo and was excused from media duties at Interlagos, while McLaren has reportedly put Mercedes reserve Nyck de Vries on standby, just in case.
A tweet from McLaren suggested that Norris was suffering from food poisoning, with doctors ordering the Briton to rest at his hotel on Thursday.
However, the papaya squad expects Norris to be up and running on Friday as scheduled.
But should the McLaren charger remain ill, de Vries - who will race for AlphaTauri next season but who remains contracted to Mercedes as the German outfit's reserve driver - would sub for Norris this weekend.
Should the Dutchman take to the track with McLaren at Interlagos, it would be the fourth team for which de Vries has driven this season.
The 27-year-old enjoyed FP1 sessions with Williams in Barcelona, with Mercedes at Paul Ricard and with Aston Martin at Monza.
But Alex Albon's sudden unavailability at the Italian Grand Prix due to appendicitis led to de Vries making his F1 race debut at the Temple of Speed with Williams.
De Vries' remarkable performance and ninth-place finish a Monza compelled Red Bull to snap up the rookie as Pierre Gasly's replacement at AlphaTauri.
Keep up to date with all the F1 news via Facebook and Twitter
Formula 1 has set up shop in Shanghai for the Chinese Grand Prix, the season’s…
Charles Leclerc believes Ferrari can recover from their lackluster start to the 2025 Formula 1…
Ahead of this weekend's Chinese Grand Prix, Racing Bulls' Isack Hadjar opened up about the…
Max Verstappen has cast McLaren as the team to beat at this weekend’s Chinese Grand…
Cosworth co-founder Mike Costin believed traction was in short supply in F1 following the widespread…
The Formula 1 world is reeling from the loss of Eddie Jordan, who passed away…