Mercedes cannot do much to help Nyck de Vries secure a Formula 1 drive and may let him go, team boss Toto Wolff said after the team's reserve replaced Lewis Hamilton in first Friday practice at the French Grand Prix.
De Vries, 27, is the reigning Formula E champion with Mercedes and also won the Formula Two crown in 2019.
Despite his success and Mercedes supplying engines to four of the 10 teams, he has been unable to secure a race seat in F1.
Mercedes are also pulling out of Formula E at the end of this season, with the team sold to McLaren who have their own roster of drivers.
Last year's F2 champion Oscar Piastri is meanwhile the hot favourite to become Formula One's newest rookie with several teams interested in the Alpine reserve.
Mercedes might have to release De Vries as there is no seat in F1 for him
Wolff told Sky Sports television at Le Castellet: "If we are not able to provide him (de Vries) with an interesting F1 project, in a way we need to let him go.
"He's looking at various options, sportscars and maybe Formula E but you must never give up on the opportunity that one day a Formula 1 door can open and today was very good. I can't really help him," added Wolff.
"We can't really tell any team to look at him and consider him because that would be felt like an interference and that goes the contrary way."
De Vries set the ninth best time in the session before handing back the car to seven-times world champion Hamilton for second practice.
It was his second such outing after one with Mercedes-powered Williams in Spain in May.
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