The midfielder joined Stoke City after impressing at Euro 2016.
Wales' Joe Ledley, Hal Robson Kanu and Joe Allen before the game
The midfielder opted to leave Anfield for Stoke City, with the Potters paying £13 million for his services.
He has joined Mark Hughes’ side in the search of first-team football, with him finding it hard to come by with the Reds last season as Jurgen Klopp picked several other stars ahead of him.
Liverpool's Joe Allen warms up before the match
His impressive performances at Euro 2016 for Wales in France showed his ability though, with some Liverpool fans sorry to see him leave.
And Thompson is among them, saying he thought this season was his time to shine.
“I was really disappointed to see him leave Liverpool,” the former assistant manager told Sky Sports.
“I thought this was made for him, I thought this was his time. He had a terrific Euros and I thought that would persuade Jurgen Klopp to say ‘you’re going to stay at this football club.”
Joe Allen celebrates with Jordon Ibe after scoring the first goal for Liverpool
It now remains to be seen if Allen can help Stoke to take the next step in the development under Mark Hughes.
The Potters are a far cry from the long-ball, physical side of the Tony Pulis era as the Welsh manager has sought to turn them into a more attractive footballing team.
Allen is another player who fits into that mould and it will be interesting to see how big a role he has to play moving forward.
Liverpool's Joe Allen