Martin O'Neill 'arguing with Dermot Desmond' over Celtic friendly
Celtic are currently working to add a fifth and final fixture to their pre-season schedule.
That is according to former Aberdeen chief executive Keith Wyness, speaking exclusively to Football Insider, who believes Martin O'Neill wants one more summer match to "fine-tune" his team.
The Bhoys have already got four pre-season friendlies on their summer agenda, with a home clash against AC Milan the standout at the moment.
Wyness believes that the final fixture will not be a "money spinner" like that game, with O'Neill keen to ensure that his group get the right preparation.
Celtic also have a home clash with Middlesbrough on their calendar, plus away matches against Irish side Shelbourne and Portuguese giants Sporting CP.
Their Scottish Premiership campaign is set to get underway on 3 August, but there is likely to be one more warm-up game before then.
Martin O'Neill arguing with Dermot Desmond over pre-season
Aberdeen's former chief Wyness - who served as CEO at Pittodrie between 2000 and 2004 and now runs a consultancy business advising elite clubs - believes that O'Neill is currently fighting his corner with Celtic's owner Dermot Desmond.
Wyness believes that the 74-year-old boss will be urging the club chief to let him have the pre-season that he feels his team needs, rather than one that boosts the club's coffers as much as possible.
Speaking on the latest edition of Football Insider's Inside Track podcast, the Scottish businessman made it clear that Celtic still have another friendly to be announced.
"I think there might be one last one to be added, like a fine-tuning one, but I don't think it'll be anything in terms of like a glamour game," Wyness said.
"The AC Milan one is obviously the big one this year, but I think there will be one more. Martin's going to have to decide what sort of opposition he wants to play against, while the board will be telling him they want to get a money-spinning game.
"The usual tension will exist as always between the Scottish boardroom and the manager. Taking Celtic somewhere is worth money because they always attract big crowds and big travelling fans.
"That's something that they'll have to be thinking about, and Martin will be arguing with Desmond about what needs to be done to make sure that they have a good season going forward.
"So I don't think anything will change in that respect, but I do expect one more game to be fitted into the pre-season schedule."
How much will Celtic make from AC Milan friendly?
Wyness previously told Football Insider that Celtic will make "multi-millions" from their friendly against AC Milan, which he expects will be played in front of a sell-out crowd at Parkhead.
He made it clear that the friendly against the Italian giants will help to maintain the Bhoys' standing as one of Europe's elite clubs.
He also acknowledged that it will be a hugely popular fixture for the fans, which means that the club are likely to reap the financial rewards in return.
That clash is due to take place on 25 July, and tickets are already limited after a strong period of early sales.