Celtic striker Jan Vennegoor of Hesselink has warned he could miss the crucial games against Benfica and Hearts next month through injury.
The Dutchman limped off in the second half of Celtic's 4-1 win at Dundee United on Saturday with an ankle injury.
The Holland international was making his return at Tannadice after suffering an ankle problem in the Old Firm victory on September 23.
Vennegoor of Hesselink missed his second Champions League clash of the campaign as the Hoops swept aside Benfica 3-0 at Parkhead on Tuesday.
And the 27-year-old could be absent for the return in Lisbon on November 1 and the Bank of Scotland Premier League clash with the Jambos at Celtic Park three days later.
He said: 'I had really no chance of making the Benfica game and, to be honest, I don't think I'll be playing for two or three weeks now.
'It's disappointing because these are the types of games I came to Celtic for.'