Nicholson said of the Middlesbrough youngster: "I am very impressed with Josh. I've had a couple of days training with him and he has had a reserve game too.
"We have certainly done a lot of talking together in the middle of the park. We tried to get on it and spread the ball around.
"It was difficult because Hamilton had three in the middle against just the two of us.
"But Josh looks to have a very good future in the game - it's just a pity he's not Scottish."