Alexander Frei claims Celtic interested in signing him

Switzerland captain Alexander Frei claims Celtic have raised their interest in signing him.

The 28 years was excluded from Euro 2008 after suffering a knee injury during his side's opening defeat by the Czech Republic.

But Borussia Dortmund before adjustment will again in six weeks and he said Celtic manager Gordon Strachan to move so he is interested.

"Apparently Celtic were in my place in 2004 and 2006," said Frei. "Now they want me again in 2008.

"However, nobody has ever made an offer on the table. If they want me they can call me. Otherwise, I do not want to talk about it. "

Meanwhile, outside the favour Celtic defender Bobo Balde has been linked with a move to Birmingham.