It has emerged that Bruno Senna will make way for Valtteri Bottas every time that the Williams reserve is given the chance to drive in Friday free practice.

The young Finn, the reigning GP3 Series champion, is focusing on his role with Williams this season, and is scheduled to receive 15 opportunities to drive during the season's 20 races. He made his first appearance in the opening 90-minute session at Sepang, ahead of the Malaysian Grand Prix, but, while it was initially expected that he would take turns to stand in for both Senna and Pastor Maldonado, it has now been reported that the Brazilian will be sidelined each and every time.

Finland's Turun Sanomat confirmed the rumour before Senna admitted the same during a brief interview with Sky Sports - even as he watched his 'replacement' pounding around the Sepang circuit.

"It's a bit frustrating, as we all want to do a lot of work for the race," Senna admitted, "It's one of those days to give an opportunity to the young guys, and he can help to get the information we need.

"[Bottas] is going to be in my car for all the Friday [sessions he is scheduled to run]. It is how it is - but hopefully it will change for next year."

Bottas ended the opening practice session a matter of hundredths quicker than Maldonado, before the Venezuelan improved his time later in the day. Senna, meanwhile, took his turn behind the wheel in the second session, but could only post the 19th best time of the day.