Williams technical chief Paddy Lowe has rejected suggestions Robert Kubica should be given more time behind the wheel in practice sessions.

The calls come as the British team sits bottom of the Constructors' Championship as the only squad not to have scored a point in the opening two races of 2018.

Adapting to the change in car design philosophy under the former Mercedes boss is one of the main hurdles Williams is having to overcome with Kubica in the role of third and development driver, meaning he is working hard in the simulator.

However, given the lack of experience of their race line-up, Lance Stroll and Sergey Sirotkin, some believe the Pole should be given more time in the FW41 itself out on track to use his knowledge to provide feedback.

"Having two young drivers doesn't make the task easier when the car doesn't work," Lowe admitted in China on Thursday.

However, by putting Kubica in the car: "We would be taking away important track time for Sergey and he needs every kilometre," he added.

The Briton has also called for calm within the team during this difficult period believing that by sticking to the task, things will change.

"Everyone in the field has their problems, but we have bigger ones," Lowe claimed.

"It would be wrong to become depressed. Only if we work purposefully can we reverse the trend."

Stroll, whose father Lawrence has invested heavily in Williams and was seen in conversation with Lowe last weekend in Bahrain, has been more vocal about his disappointment at the lack of performance so far.

“In Bahrain, it was shocking how much of a step backwards [we made] – four-tenths slower than I was last year," said the Canadian.

“We were losing time on the straights. We haven’t improved. We improved a bit in the corners, but not even close to the extent we were hoping for."

The 19-year-old isn't losing hope though.

“There’s still 19 races to go, and there’s a lot more to understand and to look at before we come to a conclusion," he added.