Di Resta is Williams' reserve driver and is now set for his first 59th Grand Prix start and his first since the 2013 Brazilian GP, when he was driving for Force India. He was then taken to the MH EK Honvédkórház hospital to complete precautionary checks, but was cleared to compete in FP3 by the FIA's medical delegate ahead of the Saturday morning session.
Williams says it "supports Felipe's decision and the team will work with him to ensure he makes a full recovery, with a view to return to the race track for the Belgian Grand Prix" in late August.
Williams reserve driver Paul di Resta reflected on a whirlwind afternoon in Hungary after swapping commentary duty for the cockpit of the FW40.
It was a Herculean task for the Scot because he had not raced in Formula One for 1,343 days or ever driven the new breed of cars.
The 31-year-old was due to be co-commentator in place of Martin Brundle, who was taken ill at Silverstone a fortnight ago with an ear-related problem that has kept him away from the Hungaroring.
"There was a bit of a miscommunication, so I didn't know that anyone was coming behind and we've now got a penalty for blocking another auto..."
"Diving straight in, I am not going to lie I was scared, nervous, anxious...", he told Sky F1, with whom he would have been commentating for had he not been in the vehicle. "I haven't driven one of these cars for three-and-a-half years apart from 10 laps I did in a 2014 vehicle and you get thrown into qualifying which is the deepest of all deep, jumping off a cliff and seeing how you can fight for survival".
"These cars are top of their game and it's like being back at home driving the best balanced vehicle you've ever driven". "It's a huge ask to give a guy no track time and literally half an hour before he's due to go out, put him in the vehicle".
"I need to rest and prepare myself in the best way to come back even stronger in Spa".
"I think he's more upset than anything else", Williams told Sky Sports on Massa's situation. From that you carry all of Felipe's brake and steering wheel settings, everything you try and work through a weekend to do, but it is hard.