Hannover have signed midfielder Ceyhun Gulselam on a free transfer from Galatasaray.
Mitchell Hancox is backing Birmingham's new arrivals to make an immediate impact and improve the club's fortunes.
Arsenal chairman Peter Hill-Wood has denied any knowledge of a takeover of the Barclays Premier League club by interests in the Middle East.
American Stan Kroenke and Russian Alisher Usmanov are the major shareholders in the Gunners and Hill-Wood does not expect either to be keen to sell their stake.
Asked about a possible £1.5billion takeover, Hill-Wood told the Daily Star: "I have heard nothing and I don't think anybody knows anything about it at the club.
"It all seems a bit of a waste of time.
"If there is this consortium, they can't make any progress unless they attempt to get in touch.
"So I can't say if there is anything to it or not.
"But even if they did make an approach, my understanding is our two major shareholders do not want to sell."