BERLIN (AFP) - Cameroon striker Mohamadou Idrissou is under investigation for threatening and insulting behaviour, Frankfurt police have confirmed to SID, an AFP subsidiary, after a report in German daily Bild on Tuesday.

Idrissou, 33, who has made more than 40 appearances for Cameroon, has been under investigation since July 25 after repeatedly threatening and insulting his former girlfriend by mobile phone.

Now playing for second division Kaiserslautern after spells at Hannover, Freiburg, Moenchengladbach and Frankfurt, Idrissou has been the subject of a restraining order since Aug 10, prohibiting him from going within 75 metres of the woman.

The striker claims a "five-figure sum" of money disappeared from his home while he helped the woman look for an apartment and his lawyer has filed a complaint of embezzlement against her.

Idrissou played in all three of Cameroon's defeats at the 2010 World Cup in South Africa and last played in the Bundesliga in the 2010-11 season for Moenchengladbach.

There was more bad news for Idrissou on Tuesday, when the German Football Federation (DFB) banned him for three matches after he was sent off at the weekend.

With the score at 1-0 to hosts Aalen, the striker was shown a straight red in the 43rd minute for elbowing Aalen centre-back Oliver Barth.

Kaiserslautern, who went on to suffer a 4-0 defeat, have 24 hours to appeal against the DFB's decision.