The 25-year-old Sweden international midfielder will be out of contract at St Andrews next summer and so would be free to discuss a Bosman-free move to a foriegn club when the transfer window opens in January.
"We've made an offer, we're just waiting on Seb to come back to us," the Blues boss has told the Birmingham Mail.
"He's at liberty to speak to foreign clubs in January. That's the Bosman rules and we will do our best.
"He's playing well, he's had a good season, but he is also in a good position for himself."