The Sauber F1 driver missed 2017's first race in Melbourne, after struggling through Friday practice and deciding he wouldn't be fit enough to complete the race.
The Mercedes junior suffered a back injury from a crash during January's Race of Champions event, which forced him to skip the first pre-season F1 test in Barcelona and avoid heavy physical training while he recovered.
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The FIA passed him fit to race in Australia, but Wehrlein only completed short stints during the second pre-season test in Spain and struggled to achieve consistent lap times during the second Friday practice session in Melbourne.
Ferrari third driver Antonio Giovinazzi stepped in at the last minute to replace Wehrlein in Australia, finishing 12th on his F1 debut, and will continue to race for Sauber until Wehrlein regains fitness.
Sauber hope Wehrlein will return to action for the third race of the season in Bahrain, but anticipates the 22-year-old may have to wait until the Russian Grand Prix at the end of April to make his comeback.
"For me the most important [thing] is that I can train intensively to ensure a 100% performance from my side as soon as possible," Wehrlein said.
"I will then be well-prepared for my first complete grand prix weekend for the Sauber F1 team.
"Hopefully this can be in Bahrain but, if not, then we will take the time it needs until Russia to make sure I am completely ready."
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