Formula One's post-season shake-up took another spin Tuesday with Williams announcing the departure of technical head Pat Symonds while Valtteri Bottas moved closer to Mercedes and Felipe Massa's retirement looked to be coming to an end. Williams said Symonds, 63, would be leaving it on Dec. 31, the news coming amid speculation that Paddy Lowe is set to join it from dominant world champion Mercedes to take up a similar role. Symonds, who worked with the late Brazilian great Ayrton Senna at Toleman in the 1980s and seven times champion Michael Schumacher at Benetton in the 1990s, joined Williams in 2013. "Pat's appointment was the start of a major restructuring exercise, and he has been pivotal in reshaping Williams into what is a much stronger racing team today," deputy principal Claire Williams said. "We now look to the future and will be announcing details regarding the team's technical leadership in due course." Symonds left Formula One in 2009 when his then employer Renault was embroiled in a race-fixing scandal after it emerged that it had ordered Brazilian Nelson Piquet to crash deliberately at the 2008 Singapore Grand Prix. The Briton returned as a consultant in 2011 with Virgin Racing, now Manor. His departure from Williams means the former world champion, which finished fifth this year, will start the year with several new faces. Canadian Lance Stroll, still just 18, will be making his race debut but his teammate remains uncertain following the surprise retirement of Mercedes' newly-crowned world champion Nico Rosberg. Bottas, who has been at Williams since 2013, is the favorite to replace Rosberg as Lewis Hamilton's teammate. Mercedes team boss Toto Wolff is also involved in the Finn's management. If Bottas leaves, Brazilian veteran Massa is tipped to come back out of the retirement he started - somewhat reluctantly when it became evident there was nowhere else for him to go - at the end of November. Media reports indicated Massa, 35, had agreed the terms for a return to Williams should Bottas go. Massa is currently on holiday, his manager Nicolas Todt was not immediately available and neither Williams nor Mercedes have confirmed anything. Williams uses Mercedes engines and a discount on them, coupled with Lowe possibly being allowed to join the team earlier than scheduled, is likely to sweeten any deal for Bottas. Mercedes, which is believed to have former Ferrari technical head James Allison lined up, has said there will be no announcement on its driver lineup until the New Year.
