“It is serious. Suarez has the possibility of being fitted with a prosthesis,” Guerra told reporters at Gremio’s stadium.
“He’s had a lot of injections, a lot of medication, he’s reaching the limit, when is the limit? We don’t know.”
The 36-year-old Suarez is still training and was named in the Gremio squad to face America-MG on Thursday in Brazil’s Serie A.
Suarez, who has a contract with Gremio until December 2024, arrived at the Porto Alegre-based club in January and has scored 11 goals in 25 games.
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Suarez has also been linked with a move to MLS side Inter Miami, where he could join up with Lionel Messi, his close friend and former team mate.