"We are pleased to inform (you) that Pascal will be ready to hit the track with the #C36 tomorrow," the Ferrari-powered Swiss team, who finished 10th out of 11 teams last year, said on Twitter.
The 22-year-old was replaced by Ferrari's reserve Antonio Giovinazzi for the first test at the Circuit de Catalunya after injuring his back in a crash at the Race of Champions in Miami in January.
Wehrlein joined Sauber from now-defunct Manor in January. The season starts in Australia on March 26.
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(Reporting by Alan Baldwin, editing by Ken Ferris)
