The Bavarian giants, who held a long-term interest in Borussia Monchengladbach's creative midfielder Marco Reus, saw their hopes of signing the precocious playmaker dashed this week after the player signed a deal to join arch rivals Borussia Dortmund next season.
"Ultimately, Bayern Munich still have a better quality team [than Dortmund]," the 59-year-old told sueddeutsche.de.
"We would rather try to find a central defender. Breno still has a chance to return, but if not, an alternative is needed. Daniel van Buyten has had a good season, but he is 34 and has knee problems."
"Our biggest problem is what would we do if Mario Gomez got injured?" he continued.
"We are going to need a real star, someone who would be good enough to play for Barcelona or Manchester United."
Hoeness also revealed that he expects Arjen Robben's contract stand-off to be settled over the next two months.
The Dutch winger's current deal expires in 2012 and the former Chelsea and Real Madrid player has expressed an interest to prolong his German stay.
"We should know in the next six weeks," Hoeness concluded.
Bayern, who are three points ahead of Dortmund at the summit of the Bundesliga standings, resume their league conquests against Monchengladbach on January 20.