Liverpool stretched their Premier League lead to 13 points by outclassing second-placed Leicester in a 4-0 win on Boxing Day as Manchester United and Tottenham cut the gap on fourth-placed Chelsea.
Arteta, who made 149 appearances for Arsenal between 2011 and 2016 before joining Manchester City's coaching staff as Pep Guardiola's assistant, replaces fellow Spaniard Unai Emery at the Emirates Stadium.
Thirteen-time winners Real Madrid were drawn against English champions Manchester City while title-holders Liverpool must face Diego Simeone's Atletico Madrid in the Champions League round of 16 following Monday's draw.
A mistake by Barca's usually excellent goalkeeper Marc-Andre ter Stegen gave the home team an equalising goal that sealed the match.
Wolverhampton Wanderers also thrashed Besiktas 4-0 in Group K, while Arsenal came from two goals down to draw 2-2 away to Standard Liege and finish first in their pool ahead of Eintracht Frankfurt.
Liverpool, which beat Tottenham in the title match in June to become European champion for a sixth time, toughed out a 2-0 victory at Salzburg to advance as the winner of Group E and stay on course in its defence of the trophy.
Suarez put Barca in front in the 29th minute before setting up Messi on his landmark night moments later.
US private equity firm Silver Lake will buy just over 10 percent of City Football Group, which owns reigning Premier League champions Manchester City, as well as teams in the US, Australia and China, the companies said.
Olympiakos, bottom of Group B, stunned the hosts with goals by Youssef El Arabi and Ruben Sabedo inside the opening 20 minutes but Tottenham responded to sweep the Greeks aside.
Mourinho's Tottenham Hotspur won a 3-2 victory over West Ham United with goals from Son Heung-min, Lucas Moura and Harry Kane.
Women football struggles to gain acceptance and equality throughout the world.
Chelsea battled to an incident-packed 4-4 draw with nine-man Ajax Amsterdam in the Champions League on Tuesday, with the hosts fighting back from 4-1 down after scoring two own goals.
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