Grant has joined the Kent club until the end of the season, after scoring 13 goals for the Ryman League side.
His agent Dan Fletcher told Sky Sports: "It's a bit of a jump for him, but we're very confident. I think he'll be in the first team in a couple of weeks.
"I expect him to be on the bench tomorrow against Port Vale and I think there will be bigger clubs watching him before the end of the season as we believe in his potential."
His agent Dan Fletcher told Sky Sports: "It's a bit of a jump for him, but we're very confident. I think he'll be in the first team in a couple of weeks.
"I expect him to be on the bench tomorrow against Port Vale and I think there will be bigger clubs watching him before the end of the season as we believe in his potential."