Fatigue has become a dominant theme of the season, with the late start creating a demanding schedule for teams with European commitments, but until recently, AC Milan had put on a good show of being unaffected by its own relentless run.
Stefano Pioli's young side began December by going five points clear on top of Serie A and winning its Europa League group.
Yet cracks have since started to show. The Serie A leader fought back from two goals down at home to Parma to salvage a 2-2 draw on Sunday, before striking back twice to earn the same result at relegation-battling Genoa on Wednesday.
The draws kept Milan's unbeaten run intact but allowed rival Inter Milan to cut the gap at the top to just one point ahead of a weekend in which Inter hosts Spezia and Milan faces a difficult trip to Sassuolo.
Injuries have played their part in the Rossoneri's mini-slump, with key men Simon Kjaer, Theo Hernandez and Ismael Bennacer missing out against Genoa.
Yet the player whose absence was felt the most is Zlatan Ibrahimovic, who could make his return on Sunday.
The Swede was in unstoppable form before suffering a hamstring injury against Napoli on November 22, scoring 10 goals in six league games - a tally that remains the joint-highest in the league with Cristiano Ronaldo of Juventus and Inter's Romelu Lukaku.
Milan has coped admirably in his seven-match absence, and on Wednesday became the first team in Serie A history to score at least two goals in 14 consecutive league matches.
But the on-field leadership qualities of the 39-year-old have been missed, as well as those of experienced centre back Kjaer.
While Milan continue to find the net with relative ease – its tally of 27 strikes is second only to Inter – the goals it shipped in the last two games have left Pioli concerned.
“Today we again conceded twice but didn’t give much away,” the coach told DAZN .
“The goals we're conceding are becoming a bit too much. Today, we didn’t mark well enough or cover the space for the two crosses.”
Milan remains unbeaten in Serie A since losing to Genoa on March 8, a run of 24 games, its best record since 1993.
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But that streak will face a stern test against a Sassuolo side that has punched above its weight this season.
Coach Roberto De Zerbi has won many admirers for his attractive style of football and he has matched that with results this season, leading the side to fifth in the standings, just five points behind Milan.
However, Sassuolo has also dipped in form lately, winning one of its last four games and scoring just two goals in that time.
Elsewhere, champion and third-placed Juventus, which trails Milan by four points but remains unbeaten, visits Parma on Saturday while Napoli, in fourth, travels to Lazio on Sunday.
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