The kid striker has jumped at the chance of a deal with the Londoners.
And Hooper told the Scottish Sun: "Islam is 16 and he's a very good player. He has quick feet and when he trains with the first team he does really well.
"I was impressed the first time I saw him.
"He's very young but he's trained with us a few times and he wants the ball. Most kids hide but he goes and chases the ball and gets it back, keeps it and does well.
"In a couple of years he'll be a really big star."