Campbell arrived last week from Cardiff City.
"I'm pleased - 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."
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