Chelsea boss Thomas Tuchel was left unimpressed by Christian Pulisic's hamstring injury suffered before the second-half kicked off in defeat to West Brom.

Tuchel suffered his first Premier League defeat with the Blues who were left stunned after a 5-2 loss to West Brom.

With Chelsea down 2-1 at half-time, Tuchel had planned to replace Timo Werner with Mason Mount.

However, as Pulisic ran out for the second-half warm-up, he pulled up after 10 yards and was unable to run past the first cone, reports the Daily Mail.

He immediately felt his hamstring and limped back to Tuchel and told his manager about the problem.

A visibly unhappy Tuchel had to change his plans and instructed one of his backroom staff to get Werner back out of the dressing room for the second-half.

Speaking in his post-match press conference, Tuchel confirmed that Pulisic tweaked his hamstring and that was why he didn't play in the second half.