Non-league to Champions League: The Porto boss out to stun Man City

Champions League Matchday One: Five things to watch

The UEFA Champions League returns this week as Europe's elite clubs begin their quest for football's most coveted prize. Matchday 1 features high-profile reunions, record attempts, and questions for several top clubs. Jose Mourinho faces his former club Inter Milan with history on his mind, while Antonio Conte looks to translate domestic success into European glory.

Barcelona must address defensive issues and Manchester United celebrate a significant milestone in their return to the competition. Here are five key aspects to watch on Champions League Matchday One.

Mourinho reunites with Inter Milan to end Spanish hoodoo

The marquee fixture of the night sees Real Madrid host Inter Milan at the Santiago Bernabeu. Former Chelsea boss Jose Mourinho returns to his old team, aiming to become the first manager to win the Champions League with three different clubs. Inter have a poor recent record against Spanish opponents in the Champions League, with no away victories since the 2004/05 season. Can the Portuguese tactician achieve the unprecedented feat of winning the trophy with three separate teams?

Barca's defensive balance under scrutiny

Despite being the best side in La Liga over the past two seasons, Barcelona's European campaigns have been plagued by defensive frailties. The Catalans have yet to keep a clean sheet in 15 Champions League matches, a statistic that must change if they are to finally lift the trophy. Manager Hansi Flick will need to address Barcelona's high defensive line, which has been exposed in previous campaigns. A clean bill of health on the defense is crucial for Barca to overcome their 12-year trophy drought.

Liverpool target Atletico Madrid's English misery

Liverpool entertain Atletico Madrid at Anfield on Matchday 1, a rematch of last season's opener in which Liverpool extended Atletico's losing streak against English clubs. The Reds won 2-0, extending Atletico's miserable record in the group stages and league phase of the Champions League. Atletico have failed to beat a Premier League side in any competition stage, losing six of their 10 previous meetings.

Liverpool could debut rookie Bradley Barcola, providing a first look at the promising young talent for Anfield supporters.

Conte struggles to crack Champions League code

Antonio Conte is a successful domestic manager, having won six league titles across four clubs and two top-five leagues. However, his European exploits have been less impressive, with only one quarter-final appearance across seven attempts. Conte's current side, Napoli, crashed out of the group stage last season despite being Serie A champions. The Italian will face a daunting first test in the competition against 2026 runners-up Arsenal, seeking improvement and redemption.

Manchester United set for milestone on return to Champions League

Manchester United return to the Champions League fold with a milestone of their own. The club will become the first English side to reach 300 games in the European competition, marking a 26th campaign in the Champions League proper. United will host Sabah in their opening fixture at Old Trafford, a milestone in their return to the competition after a three-year absence.

High hopes are placed on United to build on recent disappointing performances in the competition, with a group-stage exit in two of their last three campaigns.