Portugal's Sporting Lisbon have lodged a protest with European soccer's governing body UEFA and demanded a rematch with Schalke 04 after a last-gasp penalty gave the Germans a 4-3 win in their Champions League game on Tuesday.
The hard-fought win took Zinedine Zidane's side on to 77 points after 34 games, seven clear of second-placed Barca who visit in-form Villarreal later on Sunday.
Images from La Liga matches played on Monday.
AC midfielder Franck Kessie scored from a penalty to give AC Milan a 2-2 draw away to Napoli in Serie A on Sunday, sparing the blushes of his goalkeeper Gianluigi Donnarumma whose mistakes provided the hosts with both their goals. Sevilla closed in on Champions League qualification by beating struggling Real Mallorca 2-0 at home to open up a nine-point gap in the race for fourth spot in La Liga.
Chelsea rounded off the UEFA Champions League group stage with a 3-1 victory over Sporting.
Barca, who were without injured talisman Lionel Messi, started on the back foot and fell behind when Nabil Fekir netted with a sublime angled strike in the 15th minute. Griezmann, who joined Barca last month from rivals Atletico Madrid, scored four minutes before halftime to level the scores.
Arsenal manager Unai Emery was pleased with his team's first away clean sheet of the season.
As Jose Mourinho returns to his Portuguese footballing roots, the Chelsea manager may have to decide which back-up marksman he trusts most to shoot down his old employers at Sporting Lisbon in the Champions League on Tuesday.
Barcelona must to wait to confirm a place in the Champions League last 16 after dropping points for the first time in Group D in an absorbing 0-0 draw at Olympiakos Piraeus on Tuesday.
Images from the Champions League matches played across Europe on Wednesday.