While Mjallby has insisted that Celtic are eager to keep hold of their leading goalscorer, he conceded that replacements have already been identified.
"We don't want Gary Hooper to leave and I think that he is very happy here. The only bid has been from Norwich but we expect there is going to be offers for our best players. The main thing is we want him to stay," he told reporters.
"It would be disappointing if Gary left but we'd have to get on with it. We have a shortlist for every position. [Austin] might be on the shortlist. Charlie is a proven goalscorer and he might come in handy in the future."