Emmanuel Gyasi coolly finished a 96th minute counter-attack to give Spezia their first Serie A victory away to AC Milan, 2-1.
Atalanta ended Inter Milan's eight-match winning run and offered AC Milan the chance to claim the top spot.
Theo Hernandez struck twice in AC Milan's 3-0 Sunday stroll at Venezia to help push his team top of Serie A and put pressure on champions Inter Milan.
Stefano Pioli's side stayed four points behind city rivals and league leaders Inter Milan, who were 1-0 winners over Torino
Milan have been bumped down to third following the controversial ending but are level on 39 points with Napoli as four teams battle for the 'Scudetto'
European football matchday: Premier League top-3 in action on truncated weekend; COVID gives Hazard chance
City manager Pep Guardiola is in the fortunate position of being able to report an almost fully fit squad, with the injured Ferran Torres the only absentee.
Ibrahimovic snatched a late point for AC Milan in Saturday's 1-1 draw at Udinese which gives the Serie A leaders' title rivals a chance to steal top spot
The Premier League's top teams are all in action with the feature attraction being Steven Gerrard's return to Anfield as manager of Aston Villa.
Diego Simeone's Atletico needed to beat Porto in Portugal to advance to the knockout phase and they duly triumphed 3-1 in a game which featured three red cards.
A goalless draw at home to Benfica left Barca with their destiny in their own hands, but with a much trickier final game away to Bayern Munich
Klopp said he was making a pragmatic decision to ease the burden on his first-choice players after five matches in 15 days, with a busy festive programme also coming up
Franck Kessie and Alexis Saelemaekers both scored inside the first 20 minutes to ensure a straightforward victory for the hosts at the San Siro.
Kjaer was stretchered off early on in Milan's 3-0 win at Genoa on Wednesday and the Serie A giants revealed in a statement he would be going under the knife to repair the damage
Serie A: Milan clubs breathing down Napoli's neck after league leaders waste two-goal lead against Sassuolo
AC Milan are just one point back in second and Inter Milan another point behind in third following their respective wins over Genoa and Spezia while Napoli were held to a 2-2 draw by Sassuolo.
For what could be his final game in temporary charge of Manchester United, Michael Carrick takes his team to Premier League leader Chelsea in the headline match of the 13th round
Gabriel Jesus tapped in from Bernardo Silva's deft knockdown on 76 minutes to settle an absorbing match at the Etihad after Raheem Sterling had cancelled out Kylian Mbappe's goal.
Dusan Vlahovic struck twice as Fiorentina ended AC Milan's unbeaten Serie A record on Saturday with a thrilling 4-3 win in Florence.
Griezmann's ban by UEFA has been reduced to one game, which has already been served after the Frenchman missed Atletico's 2-0 defeat by Liverpool at Anfield on 3 November.
Griezmann has been handed a two-game ban by UEFA, the first of which was served in the return match against Liverpool, which Atleti lost 2-0, a fortnight ago.
Stefano Pioli's unbeaten side are level with Napoli on 32 points after a Stefan de Vrij own goal cancelled out Milan old boy Hakan Calhanoglu's 11th-minute penalty for Inter in a tense, exciting encounter at the San Siro.