How optermistic of him
'Killen, who was signed for Celtic by current Middlesbrough boss Gordon Strachan, admits his limited starting opportunities under Mowbray contributed to his need for a change of scenery.
"With the World Cup this summer, I knew I had to do something to get myself some game time and that's why I'm so delighted this opportunity has come up," he added.
"Of course there is a concern that I might end up moving down here swapping once bench for another. I'd be lying if I said that thought hadn't crossed my mind.
"But I still think I'll have a better chance of playing football here than I would have had at Celtic."