Milan dominated spells of the contest but failed to convert their advantage into a victory, dropping two valuable points in the race near the top of the table.
Milan struggle to break down Sassuolo
The first half ended goalless as both sides found it difficult to create clear scoring opportunities.
Milan goalkeeper Mike Maignan remained alert when called upon, while Sassuolo goalkeeper Arijanet Murić made important saves to keep the visitors at bay.
Milan also suffered a setback when defender Matteo Gabbia was forced off with an injury in the 20th minute, prompting a defensive reshuffle.
Rabiot breaks the deadlock
Milan made the breakthrough in the 63rd minute through Adrien Rabiot.
Introduced at half-time, Luka Modrić supplied an excellent through ball for Rabiot, who broke into the penalty area and fired a powerful finish into the net to put the visitors ahead.
The goal appeared to give Milan the platform to take control of the match, but their advantage proved short-lived.
Odenthal responds for Sassuolo
Sassuolo drew level in the 68th minute when Cas Odenthal fired past Maignan from close range following a corner.
The equaliser revived the home side and forced Milan to search for another breakthrough.
Both teams pushed for a winner, but neither could find the decisive goal during the closing stages.
Milan leave points behind
The 1–1 draw meant Milan missed an opportunity to strengthen their position in the Serie A title race. They remained unbeaten in the league but were unable to turn their possession and attacking pressure into three points.
Sassuolo, meanwhile, earned a valuable point against one of the league’s leading sides, showing resilience after falling behind in the second half.
What the result means
Milan moved to 12 points and fifth place in the Serie A standings after the draw, according to Reuters’ matchday report.
The Rossoneri will take encouragement from Rabiot’s goal and Modrić’s contribution, but their inability to protect the lead will be a concern as the season continues.
Sassuolo will be pleased with their response, particularly the speed with which they recovered after conceding.