Get the lowdown on the last-four ties: previous meetings, pedigree, familiar faces.
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Arsenal (ENG) v Valencia (ESP)
Eintracht Frankfurt (GER) v Chelsea (ENG)
The first legs take place on Thursday, with the returns seven days later.
Arsenal v Valencia
14/05/1980 Valencia 0-0 Arsenal (aet, Valencia win 5-4 on pens)
European Cup Winners' Cup final
- With the final in Brussels still goalless after extra time, Arsenal's Liam Brady and Graham Rix missed from the spot to hand Valencia their first European trophy.
04/04/2001 Arsenal 2-1 Valencia (Henry 58, Parlour 59; Ayala 40)
17/04/2001 Valencia 1-0 Arsenal (Carew 75)
UEFA Champions League quarter-finals
- Roberto Ayala's first-leg opener at Highbury proved crucial as Valencia reached the semi-finals on away goals, John Carew heading in late on to settle the tie at Mestalla.
10/12/2002 Arsenal 0-0 Valencia
19/03/2003 Valencia 2-1 Arsenal (Carew 34 57; Henry 49)
UEFA Champions League second group stage
- Valencia finished top of Group B to reach the quarter-finals and Arsenal missed out in third after a pair of tight games. The Gunners failed to make the most of Miguel Ángel Angulo's red card in the first match and were ultimately eliminated by old foe Carew.
L v Atlético (2017/18 UEL)
L v Manchester United (2008/09 UCL)
W v Villarreal (2005/06 UCL)
W v Lens (1999/2000 UCUP)
W v Sampdoria (1994/95 CWC)
W v Paris Saint-Germain (1993/94 CWC)
W v Juventus (1979/80 CWC)
L v Sevilla (2013/14 UEL)
L v Atlético Madrid (2011/12 UEL)
W v Villarreal (2003/04 UCUP)
W v Leeds (2000/01 UCL)
W v Barcelona (1999/2000 UCL)
W v Nantes (1979/80 CWC)
Did you know?
Arsenal defender Shkodran Mustafi was a Valencia player from 2014 to 2016, making 81 outings. There are two former Gunners in the Spanish side's ranks: Francis Coquelin made 160 appearances for for the north London club between 2008 and 2018, while Gabriel was an Arsenal player between January 2015 and August 2017, playing 64 games. Then there's Unai Emery, who was Valencia coach for four seasons until 2012.
Frankfurt v Chelsea
The teams have never met in UEFA competition.
W v Bayern (1979/80 UCUP)
L v West Ham (1975/76 CWC)
W v Rangers (1959/60 ECCC)
L v Atlético Madrid (2013/14 UCL)
W v Basel (2012/13 UEL)
W v Barcelona (2011/12 UCL)
L v Barcelona (2008/09 UCL)
W v Liverpool (2007/08 UCL)
L v Liverpool (2006/07 UCL)
L v Liverpool (2004/05 UCL)
L v Monaco (2003/04 UCL)
L v Mallorca (1998/99 CWC)
W v Vicenza (1997/98 CWC)
L v Real Zaragoza (1994/95 CWC)
W v Manchester City (1970/71 CWC)
Did you know?
This tie pits together the highest-scoring sides in this season's competition, 30-goal Chelsea against 28-goal Frankfurt.