Mercedes have announced that reserve driver and reigning Formula E Champion, Nyck de Vries will drive the W13 during the first practice session of the French Grand Prix weekend, replacing Lewis Hamilton.
It's the second time this season that De Vries will be participating in an F1 practice session, as he replaced Alex Albon at the Spanish Grand Prix, driving his FW44. He also tested Mercedes' W12 in last year's post-season Abu Dhabi Grand Prix test.
Mercedes Team Principal Toto Wolff said: "Nyck is replacing Lewis in first practice this weekend, as part of the allocated sessions for young drivers this year. So, we're looking forward to seeing how he gets on.
"Our understanding of the W13 is growing with every lap and it's encouraging to see that reflected in our development and results. While we were quicker in Austria, we still weren't quick enough to challenge at the front. We need to keep chasing those final few tenths and bringing new developments to the cars, including this weekend in France.
"Paul Ricard is a very different track and challenge. It has smooth tarmac and a wide range of corner types, along with long straights. The aim will be to make further inroads on the gap to the front and hopefully be back on the podium."