Chelsea boss Jose Mourinho could be pitted against former club Real Madrid in the draw for the semi-finals of the Champions League, which takes place on Friday.
Chelsea's dramatic victory over Paris St Germain and Real's narrow aggregate win over Borussia Dortmund in the quarter-finals earned both a place in the last four of Europe's premier club competition, where they are joined by Barcelona's conquerors Atletico Madrid and holders Bayern Munich, who beat Manchester United.
Mourinho, 51, left Madrid in acrimonious circumstances in the summer - having led them to the 2011/12 La Liga title during his three-year reign - to rejoin Chelsea, who he led to two Premier League titles and an FA Cup victory during a successful spell from 2004 to 2007.
The Portuguese has faced Real four times in Europe as a manager, all during his time as Porto boss, and has never beaten them, losing three of the matches and drawing the other.

Chelsea boss Jose Mourinho insists his sprint down the touchline following Demba Ba's goal was purely to give tactical advice.
However, that draw - 1-1 in Madrid - came in a group game during Porto's run to winning Mourinho the first of his two Champions League titles in 2004.
Friday's draw could also see the rekindling of Mourinho's rivalry with his former Barcelona colleague Pep Guardiola, who now manages Bayern Munich.
The two worked together under Sir Bobby Robson at Barcelona, when Guardiola was a player and Mourinho assistant to the late former England and Newcastle boss.
However, the relationship between the two soured somewhat when Guardiola was Barcelona boss and Mourinho was in charge of Real.
Guardiola was uncharacteristically aggressive when talking about Mourinho's conduct in press conferences, while the Portuguese snapped at one reporter who pointed out that he had only won three of his 15 meetings with his Spanish rival.

Arjen Robben said Manchester United's opener acted as a wake up call, which pushed Bayern Munich on to a 3-1 win at the Allianz Arena.
Guardiola, though, was complimentary when talking about Chelsea as a potential opponent for his side this season.
"Chelsea have a manager with a lot of experience," he said. "They are an English team with many qualities and experienced players like Petr Cech, Branislav Ivanovic, John Terry and Frank Lampard."
Mourinho also has Champions League history with Bayern before they were managed by Guardiola.
His Inter Milan side beat Bayern 2-0 in the 2010 final.
In addition, Chelsea, then managed by Robert Di Matteo, secured a dramatic penalty-shootout victory over the German side in their own Allianz Arena stadium to claim their only Champions League crown to date in 2012.
Mourinho has a better record against Chelsea's other potential opponent.

In nine matches against Atletico Madrid as a manager - all as Real boss - he won eight, although the one defeat did come in last season's Copa del Rey final, which Diego Simeone's side won 2-1.
Mourinho was typically blunt when asked about the draw, saying: "It doesn't matter who we face."
Aside from Chelsea, the draw also presents a potential Madrid derby.
Real are regular competitors at this level, but surprise La Liga leaders Atletico are appearing in a European Cup semi-final for the first time in 40 years.
If the two Madrid sides are drawn together it would be the first meeting between the pair in Europe since 1959.
The first legs of the semi-finals will take place on April 22 or 23, with the return legs taking place a week later.

Chelsea are still dreaming of European glory after eliminating Paris Saint-Germain and will learn their fate for the last four during the draw in Nyon on Friday afternoon

WHEN IS THE DRAW?

Chelsea will learn their Champions League semi-final fate when the draw takes place in Nyon on Friday afternoon.

The Blues enter the final four after knocking out Paris Saint-Germain on away goals, having lost the first leg at Parc des Princes 3-1 before securing a dramatic 2-0 win at Stamford Bridge.

The draw, scheduled to start at 12:00 CET, will be conducted by Uefa general secretary Gianni Infantino and director of competitions Giorgio Marchetti, and will be assisted by the ambassador for the final in Lisbon, Luis Figo.

WHEN ARE THE CHAMPIONS LEAGUE SEMI-FINALS?

The semi-final ties involving the four winners from the Champions League quarter-finals will be determined by an open draw. At this stage of the competition, no teams are seeded and clubs from the same national association may be drawn against each other.

The semi-finals are played on a home-and-away basis, with the first legs on Tuesday 22 and Wednesday 23 April and the return legs the following week, Tuesday 29 and Wednesday 30 April.

WHICH TEAMS HAVE QUALIFIED?

Both Madrid sides are joined by the Bundesliga champions - and titleholders - and one remaining Premier League representative.

Real Madrid
Bayern Munich
 Chelsea
 Atletico Madrid

The fact that the semi-final ties will be determined by an open draw means that Atletico could be paired with city-rivals Real again, while a rematch of the 2012 final between Bayern Munich and Chelsea is an option, too.

PLAYERS TO WATCH

Although the Champions League was robbed of stars such as Wayne Rooney, Robin van Persie, Lionel Messi, Neymar, Zlatan Ibrahimovic, Edinson Cavani, Robert Lewandowski and Marco Reus, there will still be plenty of stellar names in the last four.

Two out of the three players who made up the podium of the 2014 Fifa Ballon d'Or - Cristiano Ronaldo (Real Madrid) and Franck Ribery (Bayern Munich) - will be present.

Additionally, Real Madrid boast stars such as Gareth Bale and Karim Benzema in their squad, Chelsea have Eden Hazard, Oscar and Samuel Eto'o among others, while Atletico can call on Diego Costa, David Villa and Thibaut Courtois.

Are you convinced or Not? How about Arjen Robben and Mario Gotze (Bayern), Koke (Atletico Madrid), Frank Lampard (Chelsea) and Luka Modric and Angel Di Maria (Real Madrid)? The list goes on and on!