During victory over Wolves on Sunday, Thiago had to come off at half-time in the match due to a hamstring injury.
The setback means he could be a huge doubt for the Champions League final against Real Madrid on Saturday.
And his manager isn't holding out hope for the midfielder.
Klopp admitted: "I think he'll be out of the final but I don't know. He's limping, so it's maybe not the best sign."
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