Nico Hulkenberg is to stand in for Sergio Perez at Racing Point after the Mexican contracted coronavirus.
Perez tested positive for Covid-19 on Thursday ahead of the British GP.
He revealed he had flown back to Mexico following the preceding race in Hungary to see his mother after she was hospitalised following an accident.
Perez will be out for at least the two races at Silverstone this weekend and next but Hulkenberg has not been confirmed for the second race.
Perez said: “I’m extremely sad, definitely one of the saddest days in my career. I knew I had a great car underneath me, and the team has done a fantastic job.
“But it just shows how vulnerable we all are to this virus. I follow all the instructions from FIA and my team.
“After Hungary, I took a private plane to go to Mexico to see my mum for two days because she had a big accident, so as soon as she left hospital I was able to see her.
“And then I came back to Europe, the same way with all the protocols in place and I just got it, I don’t know from where. So it just shows how vulnerable we all are. Tough moments for me but I am sure I will come back stronger.”
Hulkenberg, who was out of F1 after being dropped by Renault at the end of last season, returns to the team he raced for in 2012 and from 2014-16.
Racing Point chose Hulkenberg over Mexican Esteban Gutierrez, who is the Mercedes reserve driver for this weekend and they had a contractual right to call on had they wanted to because of their links with the world champions.
A Racing Point statement said: “Nico’s experience of racing in contemporary Formula 1 and his strong track record ensure he is the ideal driver to stand in for Sergio Perez this weekend.
“In a bid to minimise disruption and ensure the best possible chance of building upon the team’s strong start to the 2020 campaign, Nico’s familiarity with the team will prove invaluable.”
Racing Point team principal Otmar Szafnauer said: “Having to find a replacement for Sergio at short notice is no easy task, but in Nico we’ve got a fantastic super-sub who the team knows very well.
“He’s certainly being thrown in at the deep end, but he’s a fast learner and I’m sure he will get up to speed quickly.”
Hulkenberg said: “I was on my way to the Nurburgring for another racing project when the call from Otmar came.
“That was less than 24 hours ago, so it feels a bit surreal for me right now, but I like a good challenge and this is certainly one.
“It’s obviously a difficult situation for Racing Point and Checo. He’s a buddy of mine, an old team-mate and I wish him a speedy recovery. I’ll step in and try do the best I can for the team.”
Isolation requirements for people who have coronavirus mean Perez will certainly miss the 70th Anniversary GP next weekend, and possibly the Spanish Grand Prix a week later.
Hulkenberg is expected to continue for the team as long as Perez is out, but they were not able to confirm that on Friday.