Matchday 4 treated us to two heavyweight European encounters. At Anfield, six-time winners Liverpool edged out 15-time champions Real Madrid 1-0, thanks to a bullet second-half header from Alexis Mac Allister – we hear from the goalscorer as well Los Blancos midfielder Jude Bellingham. Meanwhile in Paris, the defending champions lost 2-1 to table toppers Bayern München, their Colombian winger Luis Díaz the match winner with both goals before being sent off.Arsenal joined Bayern at the top of the table with four wins out of four, seeing off Slavia Praha 3-0 in Czechia, with a brace from Mikel Merino and a penalty from Bukayo Saka. We hear from the Gunners' manager, Mikel Arteta as well as midfielder Christian Nørgaard on 15-year-old Max Dowman becoming the competition’s youngest-ever player.Elsewhere, Arsenal’s North London neighbours Tottenham beat visitors Copenhagen 4-0, thanks to a superb solo goal from defender Micky van de Ven – we hear from the Dutchman. Napoli were held 0-0 by Frankfurt, and there were 1-1 draws for Juventus and Sporting CP in Turin, and Olympiacos and PSV in Greece. Plus there were crucial wins for Atleti and Monaco against Union SG and Bodø/Glimt, respectively.We review all of Tuesday’s action and look ahead to Wednesday’s Matchday 4 encounters, including a reunion for Manchester City striker Erling Haaland with his former club Borussia Dortmund.