The Argentinian attacker had been on loan from Al-Sadd of Qatar but has now returned.

However, there is reported to be strong interest in his services from several other Barclays Premier League clubs and he could be back in the country next season.

"Mauro's going to be an attractive proposition to Premier League clubs, in fact I know he is," said manager Alex McLeish.

"I would like to thank him for his spell here, and he made an impact, which was never going to be easy.

no disrespect

"It was a little bit of a risk bringing him in from a league where you can get away with things, be lazy and still look like a world-class star, coming into the hurly-burly of the Premier League.

"So I applaud his spirit, his heart and he will be a good asset to one of the big clubs, if not here then abroad.

"I said, at times, if he went into a team a little bit technically more proficient than us - and I meant that with no disrespect to our boys - he would be even better.

"He's a real talent and it's just a shame that our situation counted against us.

"I know he's enjoyed being here and living in Birmingham. Now we have to move on."

Zarate scored four goals for Birmingham and quickly became a fans' favourite.