The Hoops lost 3-1 to Ross County in the Scottish League Cup semi-final on Sunday afternoon.
Indeed, the Norwegian does sit top of the Scottish Premiership with the reigning champions but has already seen his Celtic side knocked out of both the Europa League and Scottish League Cup this season.
And, ahead of a busy Deadline Day for many, McCann is unsure of what the Bhoys can gain in the transfer market.
McCann told Sky Sports News on Monday morning: "They may do business. Whether it’ll be enough to take the pressure off Ronny Deila, I don’t know.
"The semi-final was crucial to Ronny Deila and Celtic. I don’t see them doing an awful lot of business, though. It’s not been a good season for Celtic."
There have been players linked with both joining and leaving the Bhoys on Deadline Day, of course.
But, as McCann says, that may not be enough for Deila as the pressure grows on the Celtic head coach.
If he is to leave at the end of the season - or sooner - bookmakers rate David Moyes as the clear favourite to succeed him at Parkhead.
Can the Scottish champions make any signings that can seriously change their season on Deadline Day or have they left it too late?