Brendan Rodgers says Dane Murray was in contention to start Celtic's game against Rangers a few weeks ago.
The Parkhead side eventually faltered to a 3-2 defeat to their fierce city rivals.
Nicolas Raskin, Mohamed Diomande and Hamza Igamane all scored for Barry Ferguson's men.
While the post-match headlines focused on Rangers' first win in Glasgow's east end in almost half a decade, before kick-off, much of the limelight shone on Rodgers' team selection.
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Indeed, fringe central defender Maik Nawrocki was brought in from the cold to start, with Auston Trusty unexpectedly injured.
Recently, however, Rodgers revealed that Murray was initially due to play before he pulled up the day before the game: "Dane Murray was someone I was looking at for the Rangers game and playing," he said.
"The day before the game, he had a wee sort of moment with his knee. So, we're just assessing that and looking at that.
"So, he'll be out as well. Apart from that, everyone's okay."
Celtic are back in action this Sunday as they face St Johnstone in the semi-finals of the Scottish Cup.
Rodgers' men lost to the Perth outfit just a fortnight ago, as Daniels Balodis' early header proved decisive.
McDiarmid Park boss Simo Valakari is taking a different view from most ahead of the match.
He said: "People will be thinking we beat Celtic at home, they’re angry now so they’ll kick our asses. But I see it the other way around.
"If they’d hammered us at home, we wouldn’t be going into this weekend with confidence. The way it’s worked out, our players know what’s possible. Of course, we know what Celtic can do to teams. You saw it last weekend.
"But we’ve shown what can happen. You will need some great saves from the keeper, you will need the defence to work properly and some luck in certain moments and when the chances come, you have to take them.
"But rather than thinking it’s not possible because we won last time, I think about it the other way. The last game gave us an understanding of what’s needed – and a feeling that we can do it."
