Celtic must put the pain of the 3-1 Old Firm derby defeat behind them and look ahead to tomorrow's Co-operative Insurance Cup quarter-final at St Johnstone, according to midfielder Ki Sung-yeung.
“With a league cup semi-final place up for grabs on Wednesday night, Ki is putting events at Parkhead behind him and looking ahead to McDiarmid Park in Perth.
Ki told the club's official website, www.celticfc.net: “I feel very disappointed because we scored the first goal, but gave them three goals in 20 minutes in the second half.
“We suffered because of a lack of concentration and we made mistakes.
“But the game has gone now and we have to concentrate on our next game against St Johnstone.”
Much was made in the build up to the fixture of Celtic's inexperience in the feisty local derby, with six players - including Ki - making their debut in the fixture.
South Korea midfielder Ki is determined to learn from and improve upon his performance in the Old Firm derby.
The 21-year-old said: “The new players who have not played in the derby can learn from this experience.
“Then, when we play in the next game, we will be more helpful to the older and more experienced players who played yesterday.”
Ki is continuing to work hard in an effort to show his worth to the team.
“I just want to be helpful to the team and try to improve myself as a player,” he said.