Johan Mjallby insists Celtic are looking for a goalkeeper to compete with Lukasz Zaluska, rather than replace him.
Fraser Forster returned to Newcastle at the end of last season following a successful loan spell at Parkhead, and the club's very public quest to bring in another keeper has cast doubt on the confidence manager Neil Lennon has in the Pole, who had a comfortable game in Sunday's 2-0 SPL win over Hibernian.
Trialist Stipe Pletikosa is already pencilled in to play against Wolves in Wednesday night's friendly at Parkhead - as he did last week in the challenge match against Cardiff in Wales - but Mjallby bristled at the suggestion that Zaluska is minding the goal until someone better arrives.
The Celtic assistant manager, who confirmed that South African striker Katlego Mphela and Slovakian striker Milos Lacny are also on trial this week and could perhaps get a run-out against the Molineux men, said: "Who said he is not good enough to be number one?
"We want to have really good come competition.
"Remember last year we had Fraser Forster who broke the record for clean sheets.
"We want someone who is as good as Fraser if we can't have him, so there is competition.
"Right now Lukasz is the number one and we have to wait and see if we can bring in someone else who can give him good enough competition.
"We are always on the lookout for quality players."