Neil Lennon was rather critical of Nicolas Kuhn after he was substituted off at halftime in Celtic's 3-2 loss to Rangers on Sunday afternoon.
The German, who has been usually effective this season, started on the right-hand side of a front three but failed to have as significant an impact on proceedings as he may have liked.
Kuhn was hooked at the break, with Adam Idah coming on in his place. Daizen Maeda resultantly moved out to play on the left-hand side, with Jota, in turn, switching to the right flank.
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The change appeared to make a difference, with Celtic netting two second-half goals, only to concede late on to a fine Hamza Igamane winner.
Post-match, Lennon, who spent two separate spells in the Parkhead dugout, criticised Kuhn after he came off at the break: "He was poor, yeah," he said (live on Sky Sports).
"Sloppy. A lack of belief. Speed. To be fair to [Ridvan] Yilmaz, he played him really well.
"It’s not just Nicolas Kuhn, the whole team was lethargic for the first 20 minutes and Rangers took the game to Celtic and they weren’t at it."
Kuhn has been one of Celtic's key assets this campaign, netting 18 goals and assisting 13 across 42 appearances in all competitions.
He was absent yesterday in the eyes of Lennon, however, and will look to bounce back post-international break against Heart of Midlothian.