What happens if an English team win the Champions League?Tottenham and Liverpool have both reached the Champions League semi-finals.
If one of those sides become European champions and finish in the top four of the Premier League, then only four English teams go into next season's Champions League. The 'extra' group stage spot would go to the Austrian champions, who otherwise need to go through qualifying as Uefa's 11th-ranked league.
However, if an English team win the Champions League and finish outside the Premier League's top four - a possibility for Spurs - then five English teams will go into next season's group stage.
There is no Champions League spot for the beaten finalists. Liverpool would not have qualified this year had they not finished in the 2017-18 top four.
Uefa changed the rules for qualification last year - starting with this season's tournaments.
In 2012 Tottenham finished fourth but missed out because Chelsea won the Champions League - but Spurs would have qualified under the current rules.
Until 2005, Champions League winners did not qualify automatically - a rule which was changed when Liverpool won the tournament but did not finish in the top four.
What happens if an English team win the Europa League?Arsenal and Chelsea are both in the Europa League semi-finals and are among the favourites to lift the trophy in Baku. If either of them win the tournament, they will qualify for next season's Champions League group stages.
If the winners finish outside the top four in the Premier League, it will mean five English teams will be in the Champions League.
However if they do finish in the top four, then England will not get an extra spot. The team who finish third in the fifth-ranked league - France - will go into the Champions League group stages instead of the qualifiers.
There is no Champions League spot for the beaten finalists.
What happens if English teams win the Champions League AND Europa League?There can be a maximum of five teams from one country in the Champions League. So that causes a bit of a mess if English teams win both European competitions - and neither finishes in the top four.
Chelsea and Arsenal are into the Europa League semi-finals, with Tottenham and Liverpool in the last four of the Champions League.
If English teams were to win both tournaments, the Premier League's fourth-placed team would not qualify for the Champions League and instead would drop into the Europa League group stages.
There would only be two Europa League spots - for the team who finish fourth in the Premier League and the FA Cup winners (or the seventh-placed Premier League team if City win the cup).
All the English teams left in Europe are guaranteed a top-six Premier League finish. The situation would be different if an English team won both competitions and finished outside the European places entirely.
If a season ever occurred when English teams won the Champions League and Europa League - and neither of them qualified for Europe through the league - there would be NINE Premier League teams in Europe (five in the Champions League and four in the Europa League).
If one of them qualified for Europe via the league and the other did not, then there would be five teams in the Champions League and three in the Europa League.