Mercedes have urged Michael Schumacher to keep on fighting, as the former multiple F1 world champion continues to be treated for injuries in a French hospital following a skiing accident four weeks ago.

The team tweeted a picture of the side of the new W05 car at Jerez bearing the message #KeepFightingMichael, hoping to inspire their former driver to a full recovery.

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The team urged other Twitter uses to spread the word by retweeting and using the hashtag in their own posts.

The team will be taking part in the first pre-season test of the year at Jerez this week, with both Lewis Hamilton and Nico Rosberg expected to take part in the three-day session. The W05 will gets its official launch in a low-key unveiling in the pit lane at Jerez on Tuesday morning.

Meanwhile there have been no further updates regarding Schumacher's condition over the weekend from the hospital in Grenoble. The 45-year-old is currently listed as stable and his condition is no longer being described as critical.

"Michael's family is very happy and confident with the work of the team of doctors treating Michael, and they trust them completely," Schumacher's manager Sabine Kehm said in an email last week. "Michael's condition is still considered as stable."