The Nigerian striker moved to Merseyside from Teesside this summer and Boro chairman Steve Gibson made comments that the forward "switched off" towards the end of his career at the Riverside Stadium.
Yakubu, though, retorted: "It is very unfair to say that. I played for Middlesbrough for two years and scored a lot of goals for them, and it is ridiculous for them to say that I switched off."
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