Krohn-Dehli joined the club from Ajax in August, but only signed a one-year contract.
“As I have always said, it’s been my desire to extend the contract. I am extremely pleased that Brondby showed me the confidence to bring me back home, even though I had suffered some injuries, and therefor I was never in doubt, when we began talks of an extension,” Krohn-Dehli told the club’s website.
The new contract will keep Krohn-Dehli at the club until the summer of 2013.