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Glasner added that the club is "working hard" to have Gibbs-White available for this weekend's trip to Liverpool in the Premier League. 

Forest faces Leeds for the second time in the space of three days after Anton Stach's 88th-minute free-kick sealed a 1-0 win for Daniel Farke's side.

During that opening-day defeat, Gibbs-White went down in the second half after a clash in midfield, and despite completing the rest of the match, the playmaker will not be available against the Whites. 

The Forest captain, who registered 25 goal involvements (18 goals, seven assists) in 53 appearances in all competitions last season, will now miss their reunion with Leeds. 

"It's still [Ryan] Yates and [Nicolo] Savona who are out," Glasner said. "Morgan Gibbs-White will miss tomorrow's game.

"He got the ball and twisted his ankle, so the MCL was a little bit overstretched, and he has some pain in his knee.

"There is no structural damage, but there's no point in risking him. We're working really hard to get him fit for the Liverpool game on Saturday, but he can't make tomorrow's game.

"A lot of players look good and fresh and tomorrow is a cup competition. We want to have the same approach no matter the competition and try to win a trophy.

"We've had players come back late and have only had a few weeks for pre-season, so there's no point risking them for a second competitive game in quick succession.

"We'll have fresh minds, and we'll try to win the game."

Forest has now lost its opening match of a league season in six of their last eight campaigns, but it will be hoping to get back on track in the Carabao Cup.

Swansea City dumped it out in the third round of the competition last season, while it has not gone beyond the third round since 2022-2023, when it reached the semi-finals.

It has won six of its seven matches against Leeds in domestic cup competitions, recording three wins in the FA Cup, two in the League Cup and most recently a 3-1 win in the Full Members Cup in October 1991.

However, as a top-flight side, Forest have won just one of its last nine Carabao Cup matches against fellow top-flight teams, losing six of those.