His £4m move to the Baggies was completed last week.
Speaking to the official West Brom website, Austin said: “It was a project that I wanted to be a part of.
“I have seen that the manager is here and with the staff and the players that he has brought in and the players that are already here it was something that as soon as the opportunity came that I jumped at.
“It is a project that I want to be a part of and their goal this year is to get promotion and I want to be a part of that.
“Many years ago you would see West Brom for what it is and you see now the new manager has come in and they are trying to turn it completely around.
“New players have come in and with the squad they have already got here it only bodes well for the future."