Striker Nathan Ellington has accused Wigan of not doing enough to keep him after joining West Brom for £3m.
Ellington has scored 67 goals for Wigan
The 24-year-old, who scored 24 goals in Wigan's promotion campaign, had one year left on his contract but chose to sign a four-year deal with the Baggies.
"I had the feeling that being a quiet sort of a fellow, they were taking advantage of me," he said.
"This is a move in the right direction. Playing for a manager like Bryan Robson will be a great thing for me to do."
The former Bristol Rovers striker netted 67 goals in 146 appearances for the Latics and his partnership with Jason Roberts fired them to second place in the Championship last season.
"I'm happy to have made the move to West Bromwich," he said.
"It was hard to leave Wigan but when you want to further your career these sort of things happen.
"West Bromwich are looking to go that extra step. They have already achieved their aim of remaining in the Premiership and they are looking to kick on."
Ellington is unlikely to be considered for Saturday's game with Portsmouth, due to a lack of pre-season practice, but manager Robson is delighted to have signed him.
"I think he gives us another dimension up front as he is very quick. He is very strong and with that mixture he is that little bit different compared to my other strikers," said Robson.