Mari, 26, helped Flamengo win the Brazilian Serie A title and the Copa Libertadores last year after joining them from Manchester City in July.
Europa League: Arsenal throw away another lead to concede stoppage time equaliser at Vitoria Guimaraes
Arsenal remain well placed to reach the Europa League knockout stages as they top the group with 10 points from their first four games.
League Cup: Liverpool reach quarter-final after besting Arsenal in penalty shootout; Manchester United beat Chelsea
Liverpool reached the League Cup quarter-finals in thrilling style as their incredible 5-5 draw against Arsenal was followed by a 5-4 penalty shoot-out triumph, while Manchester United won 2-1 at Chelsea on Wednesday.
DFB’s own ingenious concept of creating an alternate path for players from slew of tiny clubs, arriving from small towns and villages across Germany to get professional footballing training has barely been spoken of.
Premier League: Arsenal manager Unai Emery says more players could leave club before conclusion of European transfer window
Manager Unai Emery says Arsenal can challenge for a top-four place in the Premier League despite admitting more players could leave before the European transfer deadlines.
Premier League: Sloppy Arsenal's top-four ambitions suffer setback as Gunners slump to shock defeat against Crystal Palace
Arsenal's bid for a top-four finish in the Premier League suffered a major setback as Crystal Palace punished their sluggish display to claim a shock win.
Europa League: Arsenal defender Laurent Koscielny set to make return against Qarabag after months on sidelines with injury
Laurent Koscielny finally returned for Arsenal's reserves in a Checkatrade Trophy clash with Portsmouth last week and Unai Emery confirmed on Wednesday that Koscielny will start against Qarabag.
Premier League: Manchester United, Arsenal share spoils in four-goal thriller; Liverpool close gap on Manchester City with win
Given the relentless pace being set by City at the top of the table, Liverpool couldn't afford any slip-ups despite Jurgen Klopp making seven changes to his side.
Premier League: Arsenal win explosive North London derby; Chelsea bounce back with assured victory over Fulham
Arsenal secured a memorable 4-2 victory over rivals Tottenham to move above them in the table, as Chelsea moved back into third place by beating Claudio Ranieri's Fulham.
Premier League: Luka Milivojevic's late penalty rescues Crystal Palace, ends Arsenal's 11-game winning streak
Arsenal's 11-match winning run came to a dramatic end as Luka Milivojevic's late penalty rescued Crystal Palace in a contentious 2-2 draw on Sunday.
Germany head coach Joachim Loew prevented from meeting retired midfielder Mesut Ozil at Arsenal training ground
Germany coach Joachim Loew and team director Oliver Bierhoff were turned away from Arsenal's training grounds and were not allowed to meet former German footballer Mesut Ozil, who left the team after accusing the administration of racism.
Premier League: Alexandre Lacazette's late winner helps Arsenal see off Cardiff City in five-goal thriller
Unai Emery collected his second victory as Arsenal manager thanks to a fine strike from Alexandre Lacazette in a 3-2 success at Cardiff on Sunday.
Chelsea now trail Tottenham and Liverpool by 10 points with just six games left to salvage a place in the Champions League next season.
Premier League: Danny Welbeck's brace fires Arsenal to victory over relegation-threatened Southampton
Danny Welbeck inspired Arsenal to a sixth straight victory with two goals and an assist in a hot-tempered 3-2 home win over Southampton, to leave the Saints still rooted in the Premier League relegation zone.
Fantasy Premier League Gameweek 31 tips: Pick Liverpool's Mohamed Salah as captain; Wilfred Zaha might fire for Crystal Palace
In a week where only one top six side play, it is easily Liverpool who have the edge over other teams when it comes to their players picked for FPL squads.
Premier League: Marcus Rashford's star turn, Son Heung-Min taking over Harry Kane's mantle and other talking points
Manchester United were the big winners of the Premier League weekend as Marcus Rashford made the most of his first league start of the year by scoring twice to see off Liverpool 2-1.
Premier League: Arsene Wenger admits concern over empty seats at Emirates, says fans' frustration 'understandable'
Arsene Wenger conceded he could understand why Arsenal supporters are so frustrated by their team's wretched run.
Arsene Wenger claimed Arsenal's spirit has carried them through a traumatic period after Sunday's 3-0 win over Watford eased a little of the pressure on the beleaguered boss.
Arsene Wenger's problems deepened as Arsenal lost 2-1 away to Brighton in the Premier League on Sunday — the Gunners' fourth successive loss in all competitions.
Premier League: Arsenal defender Shkodran Mustafi says playing in England has helped him mature as player
Mustafi has established himself as a regular starter in central defence and says he has learnt more from his time at Arsenal than ever before.