Campbell arrived last week from Cardiff City.
"I'm pleased â€“ it's a signing we've worked very hard to do over a period of time," Pulis told the club's official website. "I'm disappointed we've not been able to bring him out here (on the team's pre-season tour of the USA), but pleased that he's signed.
"He's got a good attitude and works hard. He'll blend in well with the rest of the group because that's what the group have got."
For the big stories and the banter follow us on Twitter: @tribalfootball