Juan Mata has made a nice impression since joining Chelsea this past summer, but if he is to influence the Blues' next match, he'll do so at the expense of his former employer.

Mata and Chelsea take on his former club, Valencia, at Estadio Mestalla in one of Wednesday's high-profile UEFA Champions League group matches.

Martes 13 de septiembre de 2011 Chelsea vs Bayer Leverkusen 13:45 hrsKRC Genk vs Valencia 13:45 hrsBorussia Dortmund vs Arsenal 13:45 hrsOlympiakos vs Marseille 13:45 hrsApoel Nicosia vs Zenit St Petersburg 13:45 hrsFC Porto vs Shakhtar Donetsk 13:45 hrsBarcelona vs AC Milan 13:45 hrsViktoria Plzen vs BATE Borisov 13:45 hrsMiércoles 14 de septiembre de 2011 Manchester City vs Napoli 13:45 hrsVillarreal vs Bayern Munich 13:45 hrsInter Milan vs Trabzonspor 13:45 hrsLille vs CSKA Moscow 13:45 hrsBenfica vs Manchester United 13:45 hrsFC Basel vs Otelul Galati 13:45 hrsAjax Amsterdam vs Lyon 13:45 hrsDinamo Zagreb vs Real Madrid 13:45 hrsMartes 27 de septiembre de 2011 Bayern Munich vs Manchester City 13:45 hrsNapoli vs Villarreal 13:45 hrsCSKA Moscow vs Inter Milan 11:00 hrsTrabzonspor vs Lille 13:45 hrsManchester United vs FC Basel 13:45 hrsOtelul Galati vs Benfica 13:45 hrsLyon vs Dinamo Zagreb 13:45 hrsReal Madrid vs Ajax Amsterdam 13:45 hrsMiércoles 28 de septiembre de 2011 Bayer Leverkusen vs KRC Genk 13:45 hrsValencia vs Chelsea 13:45 hrsArsenal vs Olympiakos 13:45 hrsMarseille vs Borussia Dortmund 13:45 hrsZenit St Petersburg vs FC Porto 11:00 hrsShakhtar Donetsk vs Apoel Nicosia 13:45 hrsAC Milan vs Viktoria Plzen 13:45 hrsBATE Borisov vs Barcelona 13:45 hrsMartes 18 de octubre de 2011 Manchester City vs Villarreal 13:45 hrsNapoli vs Bayern Munich 13:45 hrsCSKA Moscow vs Trabzonspor 11:00 hrsLille vs Inter Milan 13:45 hrsFC Basel vs Benfica 13:45 hrsOtelul Galati vs Manchester United 13:45 hrsDinamo Zagreb vs Ajax Amsterdam 13:45 hrsReal Madrid vs Lyon 13:45 hrsMiércoles 19 de octubre de 2011 Bayer Leverkusen vs Valencia 13:45 hrsChelsea vs KRC Genk 13:45 hrsMarseille vs Arsenal 13:45 hrsOlympiakos vs Borussia Dortmund 13:45 hrsFC Porto vs Apoel Nicosia 13:45 hrsShakhtar Donetsk vs Zenit St Petersburg 13:45 hrsAC Milan vs BATE Borisov 13:45 hrsBarcelona vs Viktoria Plzen 13:45 hrsMartes 1 de noviembre de 2011 KRC Genk vs Chelsea 14:45 hrsValencia vs Bayer Leverkusen 14:45 hrsArsenal vs Marseille 14:45 hrsBorussia Dortmund vs Olympiakos 14:45 hrsZenit St Petersburg vs Shakhtar Donetsk 12:00hrsApoel Nicosia vs FC Porto 14:45 hrsBATE Borisov vs AC Milan 14:45 hrsViktoria Plzen vs Barcelona 14:45 hrsMiércoles 2 de noviembre de 2011 Bayern Munich vs Napoli 14:45 hrsVillarreal vs Manchester City 14:45 hrsInter Milan vs Lille 14:45 hrsTrabzonspor vs CSKA Moscow 14:45 hrsBenfica vs FC Basel 14:45 hrsManchester United vs Otelul Galati 14:45 hrsAjax Amsterdam vs Dinamo Zagreb 14:45 hrsLyon vs Real Madrid 14:45 hrsMartes 22 de noviembre de 2011 Bayern Munich vs Villarreal 13:45 hrsNapoli vs Manchester City 13:45 hrsCSKA Moscow vs Lille 11:00 hrsTrabzonspor vs Inter Milan 13:45 hrsManchester United vs Benfica 13:45 hrsOtelul Galati vs FC Basel 13:45 hrsLyon vs Ajax Amsterdam 13:45 hrsReal Madrid vs Dinamo Zagreb 13:45 hrsMiércoles 23 de noviembre de 2011 Bayer Leverkusen vs Chelsea 13:45 hrsValencia vs KRC Genk 13:45 hrsArsenal vs Borussia Dortmund 13:45 hrsMarseille vs Olympiakos 13:45 hrsZenit St Petersburg vs Apoel Nicosia 11:00 hrsShakhtar Donetsk vs FC Porto 13:45 hrsAC Milan vs Barcelona 13:45 hrsBATE Borisov vs Viktoria Plzen 13:45 hrsMartes 6 de diciembre de 2011 Chelsea vs Valencia 13:45 hrsKRC Genk vs Bayer Leverkusen 13:45 hrsBorussia Dortmund vs Marseille 13:45 hrsOlympiakos vs Arsenal 13:45 hrsApoel Nicosia vs Shakhtar Donetsk 13:45 hrsFC Porto vs Zenit St Petersburg 13:45 hrsBarcelona vs BATE Borisov 13:45 hrsViktoria Plzen vs AC Milan 13:45 hrsMiércoles 7 de diciembre de 2011 Manchester City vs Bayern Munich 13:45 hrsVillarreal vs Napoli 13:45 hrsInter Milan vs CSKA Moscow 13:45 hrsLille vs Trabzonspor 13:45 hrsBenfica vs Otelul Galati 13:45 hrsFC Basel vs Manchester United 13:45 hrsAjax Amsterdam vs Real Madrid 13:45 hrsDinamo Zagreb vs Lyon 13:45 hrs Gracias por tu visita Estadísticas de Fútbol

Chelsea followed up on Frank Lampard's urgency for Champions League glory by opening their campaign with an impressive 2-0 win at home to Bayer Leverkusen.

Second half goals from David Luiz and summer signing Juan Manuel Mata sealed all three points for Andre Villas-Boas' men at Stamford Bridge at the expense of their German visitors.

AC Milan salvaged a 2-2 draw against Barcelona thanks an injury-time header from Thiago Silva, while Arsenal were also denied a win late on by Ivan Perisic's volley for Dortmund. Elsewhere, Porto, Chelsea, Apoel Nicosia and Marseille opened with wins.

Martes 27 de septiembre de 2011 2 Bayern Munich vs Manchester City 0 2 Napoli vs Villarreal 0 2 CSKA Moscow vs Inter Milan 3 1 Trabzonspor vs Lille 1 3 Manchester United vs FC Basel 3 0 Otelul Galati vs Benfica 1 2 Lyon vs Dinamo Zagreb 0 3 Real Madrid vs Ajax Amsterdam 0 Miércoles 28 de septiembre de 2011 Bayer Leverkusen vs KRC Genk 13:45 hrsValencia vs Chelsea 13:45 hrsArsenal vs Olympiakos 13:45 hrsMarseille vs Borussia Dortmund 13:45 hrsZenit St Petersburg vs FC Porto 11:00 hrsShakhtar Donetsk vs Apoel Nicosia 13:45 hrsAC Milan vs Viktoria Plzen 13:45 hrs Gracias por tu visita Estadísticas de Fútbol

(Champions League, Septiembre 28, 2011)
Valencia 1 – Chelsea 1

Arsenal 2 – Olympiakos 1

BATE Borisov 0 – Barcelona 5

AC Milan 2 – Viktoria Pilsen 0

Shaktar Donetsk 1 – Apoel Nicosia 1

Marseille 3 – Borussia Dortmund 0

Bayer Leverkusen 2 – Genk 0

Zenit St Petersburg 3 – FC Porto 1

(Champions League, Septiembre 27, 2011)

Manchester United 3 – FC Basel 3

Bayern Munich 2 – Manchester City 0

Zenit St Petersburg 3 – FC Porto 1

Bayer Leverkusen 2 – Genk 0

Real Madrid 3 – Ajax 0

Oţelul Galaţi 0 – Benfica 1

Napoli 2 – Villareal 0

Trabzonspor 1 – Lille 1

CSKA Moscow 2 – Inter Milan 3