Sorensen sat on the bench for the Boxing Day trip to Ewood Park where another clean sheet by Asmir Begovic further cemented the Bosnian's claim to the jersey.
But Pulis has urged Sorensen to keep pushing for a return to the first team and says he will get his chance if and when his former understudy's form begins to dip.
Pulis said: "Thomas is disappointed he is not in the team but he lost his place because of injury and Asmir has come in and looked very good.
"Thomas will have to be patient and then if Asmir either drops form or gets injured it is up to Thomas to get into the team and play as well as he can. You want that competition."
Source: PA
Source: PA