The first round of group games get underway later.
Manchester United manager Ole Gunnar Solskjaer believes their summer signings have made them contenders to win trophies this season.
They begin their Champions League campaign later away to Swiss side Young Boys in Bern.
Cristiano Ronaldo, Raphael Varane and Jadon Sancho - who all joined in recent months - should feature.
Solskjaer says the squad's in a good place.
Kick off for their Group F clash is at 5.45.
Then from 8pm, holders Chelsea begin the defence of their title.
They have a home fixture against Zenit St Petersburg in Group H.
Elsewhere, Barcelona and Bayern Munich clash in Group E.
Rory McIlroy Begins Quest For Seventh Major Title Later Today
Ulster Dealt With Major Injury Blow Ahead Of Fridays Clash With Glasgow Warriors
Thursday Morning Sports Update
Ireland's 2027 Women's Six Nations Fixtures Confirmed
José Mourinho In Final Negotiations To Become Real Madrid Head Coach
Middlesbrough Manager Accused Southampton Of "Disgraceful" Behaviour After Semi-Final Defeat
US And Canadian Ice Hockey Stars To Invest In Ireland's First Ever Ice Hockey Arena
Kildare Under 20 Team To Play Tyrone In The All Ireland Semi Final Tonight Announced
