Cleveland manager Stephen Vogt said Monday that Thomas (foot) met with a doctor and has a new rehab plan in place, MLB.com reports.
Vogt described Thomas' plantar fasciitis as a "complicated case," and his return is taking longer than expected as the foot hasn't responded to treatment. The report estimates a potential return to the field in September. In the meantime, Angel Martinez has filled in as the Guardians' primary center fielder.