Form: Barcelona have bounced back from a run of three defeats in six league games to put themselves back in the fight to retain their La Liga title with four straight wins, most notably in beating Real Madrid 4-3 in El Clasico on March 23.

Lionel Messi's return to top form has played a huge role in his side's revival as the Argentine struck a hat-trick at the Bernabeu and now has nine goals in his last five games.

However, Barca remain a point behind Atletico in second with seven games of the La Liga season remaining as Diego Simeone's men remain on course for their first title since 1996 thanks to five consecutive league wins.

Diego Costa has led they way in a similar manner to the way Messi has for Barcelona as the Spanish international has struck 25 times in La Liga and has seven goals in just five Champions League appearances in his first season in the competition.

Coaches:

Barcelona - Gerardo Martino (ARG) 51 yrs

Atletico Madrid - Diego Simeone (ARG) 43 yrs

Leading scorers in all competitions

Barcelona - Lionel Messi (36 goals)

Atletico Madrid - Diego Costa (33 goals)

Domestic league performance

Barcelona - Second in La Liga, a point behind leaders Atletico

Atletico Madrid - First in La Liga with seven games to go and three points ahead of third-placed Real Madrid.

Last 16 performances:

Barcelona - beat Manchester City 4-1 on aggregate thanks to a 2-0 win in the first leg at the Etihad before finishing the tie off with a 2-1 victory at the Camp Nou.

Atletico Madrid - Overcame AC Milan with ease 5-1 on aggregate. A 1-0 win at the San Siro setting up a famous night at the Vicente Calderon as Atletico emerged victorious 4-1 on the night.

European Cup/Champions League best performances:

Barcelona - winners 1992, 2006, 2009, 2011

Atletico Madrid - runners-up 1974

Other honours:

Barcelona - 22 x Spanish champions, 26 x Copa del Rey winners, 4 x Cup Winners' Cup winners, 3 x Inter-Cities Fairs Cup winners, 2 x Club World Cup winners, 1 x Intercontinental Cup winners

Atletico Madrid - 9 x Spanish champions, 10 x Copa del Rey winners, 2 x Europa League winners, 1 x Cup Winners' Cup winners, 1 x Intercontinental Cup winners

Previous meetings: First time the clubs have met in European competition. Barcelona lead the historical head-to-head between the two 93-74 with 48 draws.