The Hoops went down 1-0 to Hearts in front of home fans in the quarter-finals of the Scottish CIS Insurance Cup, ending their run in the competition.
But Celtic will now focus their attention back to the league when they host Kilmarnock in week 10 of the season on Saturday night (Sunday morning Australian time) and McDonald said a win is paramount in keeping their lead over Rangers at the top of the table.
“Wednesday was a slight aberration on our part but we just have to put that behind us now,” McDonald told tribalfootball.com.
“Next we focus on Kilmarnock and the chance to go further ahead on top of the table.”
As always, Setanta Sports will be showing plenty of other football action this weekend for your viewing pleasure.
Saturday 31st October
5:30am Ligue 1 Preview Show
6am Bundesliga Preview Show
6:25am Bundesliga Borussia Dortmund vs Hertha Berlin LIVE
4:30pm League of Ireland Bohemians vs Sligo Rovers
9:55pm Russian Premier League FC Moscow vs Zenit St Petersburg LIVE
Sunday 1st November
Monday 2nd November
1:45am Eredivisie Ajax vs Feyenoord
3:25am Bundesliga Freiburg vs Hoffenheim LIVE
6:40am Serie A Palermo vs Genoa LIVE
9am Serie A Livorno vs Internazionale
10:45am Bundesliga Frankfurt vs Bochum
2:15pm Russian Premier League Spartak Moscow vs FC Rostov
4pm Ligue 1 Sochaux vs PSG
5:45pm Serie A Highlights Show
6:30pm Ligue 1 Highlights Show
7:30pm Bundesliga Highlights Show