"He hasn't had a pre-season for two years but if we can get him fit he's the sort of player who could be worth a lot of money -I think he's the new Jason Roberts," Byrne has said.
"Whether he can come here permanently is something we'll have to sit down and talk about from now until the end of the season.
"I think he's out of contract in the summer but that's something we'll have to discuss with our board of directors and also with Watford."