The Chelsea striker had a season on-loan at WBA two years ago.
Fullback Pocognoli revealed: "I follow the Premier League so I know West Brom is a good club.
"My mate Romelu Lukaku played here before so I know a little bit about the club, the history. It's a good club, with a good image and for me it's exciting.
"I spoke to Romelu. He gave me the best opinion on the club. He was very positive and said to me that if I have the opportunity to go there then I should take it. His experience here was great. He scored a lot of goals, his relationship with the supporters was very good too.
"I received a great welcome from the group, the trainer and the staff."
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