His career at Middlesbrough ended after he made no effort to contribute to the 1-0 defeat at Wigan 10 days ago. This led to attacks from his team-mates making his position at the club untenable.
Yakubu failed to score in his last 14 starts for the Teessiders and looked uninterested well before the end of last season.
Before the rot set in he had an impressive run of 17 games in which he scored 12 goals.
Overall he made 88 starts (plus 16 sub appearances) and scored 35 goals.