Arsene Wenger blasted Arsenal's defenders for their sloppy display as Stoke stunned the Gunners with a 1-0 victory on Saturday.
Arsenal want to sign Real Madrid starlet Marcos Llorente but will face a fight with Sevilla and Atletico Madrid.
Jese sinks Arsenal, Man United hit four again
Sofapaka also fill Nakumatt trolley with goals in Narok.
Manchester United maintained their dream Premier League start as goals from Eric Bailly, Romelu Lukaku, Paul Pogba and Anthony Martial secured a 4-0 victory at Swansea City on Saturday.
Manchester United are satisfied with their transfer business and under no pressure to sign a fourth player in the current window, manager Jose Mourinho said.
Champions Bayern Munich comfortably beat Bayer Leverkusen 3-1 in the Bundesliga season opener on Friday to lay down a marker as they eye a record-extending sixth straight German league title.
Spanish club Valencia have completed the signing of defender Gabriel Paulista from Premier League side Arsenal on a five-year contract, both clubs said on Friday.
Barcelona's players will bear the city's name on the back of their shirts in tribute to the victims of Thursday's deadly attack in the Catalan capital when they play Real Betis in La Liga on Sunday, the club said in a statement.