Thomas spent an extended trial spell with Liverpool.
"He's an outstanding young player. I think he can play at the very top in the Premier League," said Pressley.
"Conor is six foot one, extremely powerful and quick. He can cover the ground really well, but he can also handle the ball.
"He has a good understanding of the game and he's a good example off the pitch too.
"Even on his days off this week, he's still been in working on his game."
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