Zoran Mamic has warned his Dinamo Zagreb side they will have to up their game against Celtic.

The Croats remain undefeated in their league but could only manage a goalless draw against bottom side Slaven Koprivnica at the weekend, days after a laboured performance in beating lowly fourth-tier outfit NK Ponikve 2-1 in the Croatian Cup.

"These games are a warning that we cannot repeat these performances," said the coach. "The team had been working perfectly but I had a feeling it might go in the wrong direction. Of course, the devil never sleeps and we must not repeat the situation as it was against Ponikve a few days ago, especially when we know what awaits us on Thursday."

n Police are investigating a complaint that Celtic defender Virgil van Dijk was subjected to racial abuse during his side's victory at St Mirren Park. The Dutchman reported an incident to police in Paisley, after hearing chants from the crowd.

The SFA have postponed a hearing into allegations of racist abuse levelled at Celtic winger Aleksandar Tonev until October 30 because the Bulgarian has been called up to for international duty the day after the scheduled hearing on October 9.