Pollock, 28, has spent the past three seasons in Europe, where he led the Sunipret Ice Tigers of the German Elite League with 22 goals and 32 assists in 46 games in 2006-07. He tied the league record for goals by a defenceman.
He played nine games for the St. Louis Blues in 2003-04.
Wilson recently finished his first season with the Capitals' American Hockey League affiliate, the Hershey Bears, where he was the team's rookie of the year. He scored 24 goals and 54 points in 54 games.