Bruce said: “I am delighted to acquire the services of Sebastian. When I set about rebuilding the side in the summer I wanted to bring in people who were hungry and had energy – and he fitted that category.
“Of course, like all young players, there have been ups and downs – and don’t forget this has been Sebastian’s first extended taste of first-team football.
“But overall I have been delighted with him. He has played in a number of positions and has been improving all the time.”