Kelechi Iheanacho was a notable absentee for Celtic in the 2-2 draw against Rangers on Sunday.
The former Leicester striker was not included in the matchday squad for the Scottish Premiership clash at Ibrox at the weekend.
Iheanacho, 29, had made an appearance off the bench in the Europa League win over Stuttgart on Thursday night, but disappeared from the team sheet for Sunday after his 12-minute cameo.
Junior Adamu started up front for Celtic against Rangers, with Daizen Maeda shifted into a central role in the second half.
Iheanacho's absence was not addressed by Martin O'Neill on Sunday after Celtic battled back from two goals down to claim a late point in the derby fixtures.
However, further confusion has been caused by training footage emerging from Manchester, posted on Sunday morning, featuring Iheanacho.
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Coach Kwaku Ohemeng, founder of the Seedorf Football Academy, posted video clips of Iheanacho going through training drills.
The videos were shared on the same day as the draw between Celtic and Rangers, with simple text reading "Sunday" at the top of the footage.
It is not clear whether the footage was simply posted on Sunday or whether Iheanacho was in Manchester for specialist training over the weekend. Videos were tagged with Manchester as the location when posted on Ohemeng's Instagram story.
Iheanacho shared the clips on his personal Instagram account on Monday morning.
Footage of Patrick Dorgu was also shared by the Seedorf Football Academy coach on Sunday. The Manchester United defender is currently sidelined due to a hamstring issue.
Jeremie Frimpong has also gone through training specialist training sessions with the coaching set-up away from his club.
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