Short term, performance based. If he's crap or gets crocked, he's out.
He's still only 32, so still has the opportunity to give something. And he certainly has the experience we otherwise lack. His presence in the dressing room may well be a useful thing for us, as I'm sure that come 2:45 on the day of the Bolton game, some of the youngsters may well be setting the cubicle doors a-swinging...