La Liga champions Barcelona began the new campaign with a 3-0 win over Alaves on Saturday with the help of a spectacular under-the-wall free kick from Lionel Messi, who scored twice, and a curling shot from substitute Philippe Coutinho.
Juventus and Inter, who have 42 points each from 17 games, both play on Monday while Lazio, with 39 from 17, have an outstanding fixture at home to Verona to come in early February.
Netherlands revived bitter Spanish memories from last year's World Cup finals when they beat a second-string La Roja 2-0 in a friendly.
Manchester City squandered a gilt-edged opportunity to close the gap on Premier League leaders Chelsea when they let slip a two-goal lead to draw 2-2 at home to struggling Burnley on Sunday.
Chelsea's unbeaten start to the season ended with a dramatic 2-1 defeat at Newcastle United; Champions Manchester City took full advantage of Chelsea's surprise reverse to cut the gap at the top.
Arsenal maintained their challenge for a first trophy in nine seasons when they beat Liverpool 2-0 at the Emirates Stadium to open up a five-point lead at the top of the Premier League on Saturday.
Jose Mourinho got the better of old adversary Arsene Wenger once again as Chelsea showed their strength-in-depth by reaching the League Cup quarter-finals with a 2-0 win over London rivals Arsenal on Tuesday.
Former Real Madrid striker Predrag Mijatovic criticised Gareth Bale for lacking leadership qualities
Photos from the Euro 2016 qualifying matches played across Europe on Saturday
Images from the Champions League round of 16 second leg matches played on Tuesday
Liverpool produce an irresistible performance to dismantle a toothless Tottenham Hotspur 3-0 and Arsenal were held 1-1 by Leicester City in the Premier League on Sunday.
Danny Rose scored a second-half equaliser to cancel out James Milner's penalty as Tottenham Hotspur came from behind to draw 1-1 with Liverpool at White Hart Lane on Saturday.
An Aaron Ramsey strike and a Kalidou Koulibaly own goal gave Arsenal a 2-0 victory over Napoli in the first leg of their Europa League quarter-final, while Chelsea beat a stubborn Slavia Prague 1-0.
This and more from the happenings in the world of football
Images from the UEFA Champions League matches played across Europe on Wednesday
Coach Pep Guardiola was left thrilled after ManchesterCity revived their Champions League bid by beating his old club Barcelona 3-1 in a gloriously open Group C encounter at the Etihad Stadium on Tuesday.
Cristiano Ronaldo renewed his personal battle with Lionel Messi by scoring his 71st Champions League goal, putting him three behind the Argentine's newly-set record, in Real Madrid's 1-0 win at FC Basel on Wednesday.