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Celtic are currently enjoying a mid-season break with a training camp in Dubai ahead of the second half of the season.
The Hoops ended the first part of the campaign with a defeat to arch-rivals Rangers, a result that has thrown the Scottish Premiership title race open.

The Hoops are eager to strengthen their squad this month and have been linked with a number of players, including Tino Kadewere, Patryk Klimala and Andraz Sporar.
When speaking about potential arrivals with BBC Sport, Lennon said:
There’s a number of options out there that we’re working hard behind the scenes to try and negotiate a deal.
We’re hoping by the time this week finishes to have one or two new faces in but I can’t give a specific number.
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The Hoops need to be active in this month’s transfer window to successfully defend their league title and also put together a good run in the knockout rounds of the UEFA Europa League.
Lennon knows that fans are desperate for some new signings and he needs to deliver sooner rather than later, or else the restlessness amongst the fanbase will continue to increase.
With Scott Sinclair set to leave on loan to Preston, the Hoops need to prioritise an attacking player who can provide a goal threat. Lennon and Celtic need to deliver.