He has sighted conversations with his national team teammate, Luis Suarez, that the Reds playmaker's opinion of the club made it nearly impossible to resist.
The defenders was voted the best player in the Copa America tournament and despite other interest from Manchester City and a late bid from Atletico Madrid he is following Suarez to Liverpool:
"The offer ticks all the boxes, so you can say that the transfer is a done deal," said Coates. "The chance to move to Liverpool is very attractive.
"It's a club with a lot of tradition and history in English football, and the fact that Luis is there is a great help for me.
"I have spoken to him. He got in touch with me and we had a chat. It is good there is another Uruguayan already in the team - it is easier if there is someone I know well.
"He has told me what the club is like. It's important because he won over the fans straight away and is scoring lots of goals. He's doing really well, and that's good for me as another Uruguayan arriving."
It looks as though the departure of Sotirios Kyrgiakos to VfL Wolfsburg was is anticipation of the arrival of Uruguayan Coates and he will be Kenny Dalglish's sixth first team purchase this off season if everything goes according to plan.