"Every game is important," Mourinho told the club's official website. "Shrewsbury in the Capital One Cup is not a friendly.
"We have to play matches with respect and the best way to respect Shrewsbury is to go there with a good team, not to go there with a weak team and lose. We will go there with a good team. If they win they win, but they win against a good team."
Shrewsbury host Chelsea after winning their last four League Two fixtures.