Hakan Calhanoglu (right) scored his fifth goal in four games for Borussia Dortmund
Premier League preview
Watford (13:00 BST) v Manchester City (14:00 BST)
If manager Pep Guardiola wins one more trophy during his tenure at Manchester City, he will finish a winner in each of the four domestic top-flight competitions he has ever won as a coach.
Only Jose Mourinho (a treble in domestic, European and FA Cup competitions in 2004/05) has triumphed in all four of those club competitions in one season.
It is a statistic Guardiola wants to improve on on Saturday and he has the perfect opportunity to do just that.
Converting Champions League form into Premier League success
Manchester City have qualified for the Champions League knockout stages for the seventh consecutive season – they will be facing the winner of the Premier League’s bottom two – but have yet to progress beyond the last 16.
The Citizens have beaten all but one of their 11 teams since Guardiola took charge in 2014/15 – winning 8, drawing 2 and losing 1 (all against Barcelona).
But only once have City secured a win over an English side in Europe’s elite competition – a 2-1 defeat at Arsenal in May 2016.
The forward line has scored the most goals in Europe’s top-tier competition under Guardiola (18) but has also conceded the most (34).
City have qualified for the knockout stages of the Champions League for the seventh consecutive season – but they haven’t progressed beyond the last 16 in any of those years
With Sergio Aguero, Kevin De Bruyne and Raheem Sterling among those to have impressed in Europe this season, City will have confidence they can overcome a Watford side who lost at home to Newcastle and are in ninth spot in the Premier League.
The Vicarage Road club have managed just seven goals in their seven league games so far this term – but have scored 11 in their four Champions League matches – with Bakary Sako scoring twice in each of those four games.
Watford to end August winless streak
The Hornets are without a victory in their five Premier League games this season – a run that stretches back to August.
Back-to-back defeats against rivals Everton and Chelsea have seen manager Marco Silva take his side’s victoryless run to three matches.
Key man: You will not hear many City fans complaining about the form of Bernardo Silva.
Although he has only scored once in his first six games for his new club, the Portuguese has made 12 key passes this season (double any other City player) and had 12 dribbles, six shots and six crosses.
Analysis from BBC Radio 5 live’s Ian Dennis
Whether it is the Europa League or the Premier League or both, Pep Guardiola is good at avoiding distractions.
The Barcelona manager will make a triple substitution with six minutes left on the clock. You might catch a stray glance at him.
Even when his side were trailing 3-0 at home to Lyon in the first leg of their quarter-final on Wednesday, he thought enough was enough. He cleared his bench.
For all of Watford’s pre-season talk of possible success, their poor start to the season is embarrassing. This could be a match they cannot turn around.
Barcelona v Borussia Dortmund: The bitterest rivalry in European football
Tipped to become the first English club to win the Champions League since Liverpool in 2005/06, Pep Guardiola remains a blank in La Liga (this season) after 10 matches.
Unbeaten Dortmund sit five points clear of second-placed Madrid, and one point ahead of leaders Atletico, after winning seven games and losing two.
They have been masterminding a perfect start to the season, having scored 12 goals and conceded only two.
The German side boast a handful of in-form strikers; Pierre-Emerick Aubameyang and Shinji Kagawa have scored seven goals each, while Marco Reus has six.
Notching up the goals are French defender Raphael Guerreiro and Danish midfield duo Henrikh Mkhitaryan and Julian Weigl, while star midfielder Marco Reus also is at the top of the assist charts with three in three games.
‘A tiny piece of paper that can change our history’
Pep Guardiola’s first season in charge at Barcelona was one of the finest of his managerial career.
Ahead of his side’s meeting with Dortmund, he described a summer assignment to create a 3D model of the Catalan club on a computer screen as a ‘tiny piece of paper that can change our history’.