Mercedes chief Toto Wolff has aimed a sly dig at Haas team principal Guenther Steiner over his handling of Mick Schumacher.
Schumacher, the son of Formula One legend Michael, joined Mercedes for this season as a reserve driver after being dropped by Haas. The 24-year-old was with Haas for two seasons yet was let go following a series of high-profile mistakes, with the more experienced Nico Hulkenberg taking his place.
Steiner wrote in his book that Schumacher had cost Haas over £1.6million from big crashes in Saudi Arabia, Monaco and Japan. He is now working behind the scenes at Mercedes as a back-up to Lewis Hamilton and George Russell and Wolff has been delighted with his impact.