Petrov will meet with Gordon Strachan today for the first time this week. Portsmouth have now reportable made a second offer and Petrov I desperate to move to the Premiership.
The players agent, McGill said: ‘He is frustrated and I have advised him to speak to the manager tomorrow.
‘Even if Celtic agree a fee, there is no absolute guarantee that anything will happen, because we would then have to speak to Portsmouth. We’ve got a very unhappy player on our hands.’
Portsmouth`s second offer is not thought to match the five million being demanded by Celtic.