Birmingham City are stunned by Cacau's decision to sign a new deal with Stuttgart.

The Birmingham Mail says Cacau, who has scored 12 league goals this season, flew into Birmingham for hush-hush talks three weeks ago and was shown around St Andrew's and Wast Hills.

He promised to make a decision quickly thereafter. A contract was drawn up and the feedback from his representatives suggested he was excited by the challenge of the Premier League.

But he got cold feet and on Friday night penned a new deal with Stuttgart until 2013 after initially turning down a contract there at the turn of the year in order to seek pastures new.