FORMER Celtic striker Frank McAvennie admits he is at a loss to explain Giorgos Giakoumakis' slow start in Glasgow as he tipped the Greek striker to leave Parkhead this month.

The Grek centre-forwar dscored 26 goals in 30 games in the Dutch top flight last term, finishing the season as the Eredivisie's top scorer.

A summer switch from VVV-Venlo to Parkhead followed but the 27-year-old has struggled to make a big impression in Ange Postecoglou's starting XI so far, making eight appearances and scoring a solitary goal.

Celtic's attack has been reinforced after Daizen Maeda was brought in from Postecoglou's fomrer club Yokohama F. Marinos but McAvennie would like to see more forwards added to the squad as he predicted a January exit for Giakoumakis.

"I’ll never say no to new strikers coming in," he told Football Insider.

"I think we have some great strikers. Kyogo [Furuhashi] has obviously proved it and the new guy Maeda is really exciting.

"I look at [Albian] Ajeti and he’s not done it. I’ve said enough about him at this point.

"Giakoumakis, he’s not done anything really, has he? He barely plays and I do wonder why did we sign him?

"I don’t know if it’s a fitness thing or if he’s not up to the task but he was on fire last season.

"He doesn’t look right here. I just wonder if a loan spell might be best for him.

"I think if another striker comes in then he will definitely leave. The squad needs to be smaller now, not bigger."