The German has been fighting to regain fitness and pass a medical check following his accident at the Race of Champions in Miami, where he crashed after contact with Felipe Massa.

On Sunday he tweeted a picture from a gym, saying he was "working hard to come back soon."

Sources have told Motorsport.com that the German will finally be able to return to the cockpit this week.

Ferrari reserve driver Antonio Giovinazzi stood in for him at the first Barcelona test last week, and made a good impression.

The Italian remains on standby this week should Wehrlein have any issues once he's been in the car and experienced the g-forces associated with this year's high downforce regulations.