The American winger was down at halftime, during his 5-2 loss at West Brom on Saturday. Pulisic began the season by recovering from a hamstring strain, which he suffered in the FA Cup final loss to Arsenal last year.
He has struggled to stay in shape since his return in October.
Pulishik was allowed to impress against the Baggies early on and recorded his second Premier League goal of the season to keep his team ahead. However, he was replaced by Mason Mount early in the second half.
According to NBCSN insider Robbie Earle, Tuchel had complained to Pulisic of a hamstring drink, which would likely raise suspicions of a first-leg draw against Porto in the Champions League quarterfinal next. week.