Everton striker Ayegbeni Yakubu claims Middlesbrough's lack of ambition forced him to leave the Riverside Stadium.
The Nigeria striker swapped Teesside for Merseyside in August in an £11.25million transfer.
Yakubu had scored 35 goals during two years with Boro but decided to join the Toffees after sensing a change in the club's ambition.
The 25-year-old, who has netted 11 times for Everton this season, previously played for Portsmouth.
"Before I left Portsmouth I looked at Middlesbrough and saw they had ambition, but I don't think the ambition is there any more," he said.
"With no disrespect to the players, Middlesbrough are not that ambitious and that is why I had to leave.
"Before the end of last season I had made up my mind to leave. It was a blow to lose Mark Viduka, because he was a great player who I enjoyed playing with.
"I wanted to move to a club which had ambition and at the moment Everton have ambition.
"They are fighting for trophies and they want to finish in the top six and play in Europe.
"I am really happy. We are chasing a trophy in the Carling Cup and if we can win something that would be a great season both for me and the club.
"I moved at the right time and made the right decision to go. I don't regret it."