Middlesbrough chairman Steve Gibson says the sale of Yakubu Aiyegbeni to Everton is a good business for the club and admitted he believes the Nigerian "switched off" halfway through last season.

He told BBC Tees: "We got 18 very good months out of him. He switched off half way through last season, we've never really been able to understand why, but sometimes you've just got to move on and that's what we decided with Yakubu. It's just disappointing he made the decisions he did so early in this season and so late in the summer."