The Hoops slumped to their fourth defeat on Wednesday when they were beaten at home by Hibernian 2-1 - a loss that saw them fall 10 points behind title rivals Rangers and only two clear of Hibs who are third.
McDonald is well aware that this weekend is vitally important for Celtic if they are to be any chance of winning this season's premiership.
"We know we have to start putting some wins together otherwise they (Rangers) are going to get away from us," McDonald told tribalfootball.com.
"The loss midweek was very disappointing and all the players and the coaching staff are determined to turn it around and get ourselves back in the race for the title."
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Sunday 31st January 2am SPL Rangers vs FalkirkLIVE 4:30am Bundesliga Schalke vs HoffenheimLIVE 6:40am Serie ANapoli vs GenoaLIVE 9:15am African Cup of Nations 3rd Place Play-Off Teams TBC 6:30pm Ligue 1Montpellier vs Marseille 10:30pm EredivisieFeyenoord vs AjaxLIVE
Monday 1st February 1am Serie AParma vs Internazionale LIVE 3am African Cup of Nations Final Teams TBCLIVE 7am Ligue 1 Lyon vs PSGLIVE 9am BundesligaStuttgart vs Borussia Dortmund 10:45am BundesligaBayer Leverkusen vs Freiburg 4pm Ligue 1Lille vs Lens
Wednesday 3rd February 6:30am FA Cup 4th Rnd Replay Crystal Palace vs Wolverhampton LIVE 9:30am Coppa Italia Teams TBC
Thursday 4th February 6:30am FA Cup 4th Rnd Replay Leeds Utd vs Tottenham LIVE 10:45am Copa Libertadores Cruzeiro vs Real Potosi LIVE 1:15pm Scottish League Cup Semi Final Rangers vs St Johnstone 6pm Euro Cup/League Teams TBC