Tottenham Hotspur, Newcastle United, Blackburn Rovers and Rangers secured four berths for British teams in the knockout phase of the UEFA Cup on Thursday.
Barcelona earned a thrilling 3-2 win at Celta Vigo in their opening Primera Liga match.
However, Arsenal will be without Gilberto and Ashley Cole for the Champions League match against Celta Vigo.
Villarreal's La Liga match at home to Celta Vigo was suspended shortly before the final whistle when a smoke bomb was thrown on to the pitch on Saturday.
'Rivaldo remains at Milan and tomorrow will leave with the squad for Vigo,' Milan vice-president Adriano Galliani said.
A round-up of weekend action in the major European leagues.
Barcelona's 100 per cent start to the season was ended by Catalonian neighbours Girona, who picked up a draw at the Nou Camp, allowing Real Madrid to take advantage with a victory over Espanyol.
An injury to playmaker James Rodriguez could prompt Real Madrid to dip into the transfer market next month and they are interested in Cruzeiro midfielder Lucas Silva among others, coach Carlo Ancelotti said on Monday.
Here are five talking points from the weekend in La Liga.
La Liga leaders Barcelona drew 0-0 at Huesca on Saturday and are nine points clear of second-placed Atletico Madrid, who cut the gap by beating Celta Vigo 2-0.
The draw means second-placed Atletico Madrid could close the 12-point gap with Barcelona, who are on 74 points, if they beat Celta Vigo later on Saturday.
27-year-old Manuel Almunia would join Arsenal subject to a brief trial at the club.
A 0-1 loss handed Barcelona their first defeat in 18 matches.
The Brazilian striker scored twice in a 3-2 victory over Celta Vigo in the Champions League first leg knockout tie.
The Arsenal captain is a doubt for the match against Celta Vigo after injuring his knee on Saturday.
Barcelona lost 1-0 at home to Real Zaragoza on a night of upsets in King's Cup quarter-final, first-leg ties on Thursday.
The 48-year-old Argentine saw his side produce a stirring fight back from three goals down to draw 3-3 with Liverpool in the Champions League on Tuesday and Spanish media reported that he told his players about the illness at half-time.
Kaka wants Real fans to show more gratitude to Cristiano Ronaldo.
The Spanish League leaders slipped to a 2-0 defeat at home to Real Mallorca.
United's leading goal-scorer suffered knee ligament damage during the 2-1 Europa League quarter-final win over Anderlecht last month and has been ruled out for the rest of the season.
Depor's two Barcelona-born players scored in each half to secure victory at the Nou Camp.
'It wasn't easy, but I called him last night (Sunday) and we had a difficult and tough conversation. I feel bad as he's a player who has always been at the top level and has a future with the national team.'
France forward Antoine Griezmann says he would only leave Atletico Madrid if manager Diego Simeone also quit the La Liga club.
Real went top with one game to play after thrashing Atletico Madrid 4-0 while rivals Sociedad slipped to a 3-2 defeat at Celta Vigo.
Barcelona were in danger of being toppled from the top of La Liga standings on Sunday after they suffered a shock 2-1 defeat at Deportivo La Coruna.
Real Madrid romped to a 4-1 win at tiny Eibar on Saturday, provisionally returning to the top of La Liga, despite the absence of Gareth Bale and Cristiano Ronaldo for Zinedine Zidane's side.
La Liga champions Barcelona stayed on the heels of leaders Real Madrid by coasting to a 3-0 home win over Athletic Bilbao on Saturday as Lionel Messi became the club's top scorer from free kicks.
Sevilla became surprise Liga leaders on Sunday after beating visiting Celta Viga 2-1 while champions Barcelona drew 1-1 at Valencia thanks to another Lionel Messi strike but are still without a victory in their last four league games.