Question: What defensive midfielder/center back was contracted by the same man who contracted Carlos Tevez?

Context paragraphs:
Christos Melissis: Christos Melissis, (; born 1 December 1982) is a Greek football player.  He has played in the past for Naoussa, Panserraikos, PAOK, Panathinaikos, Larissa, Panthrakikos, Marítimo in Portugal and the Greek national football team.  He usually plays as a center back but when called upon he is used as a right back or a defensive midfielder.

Sargon Duran: Sargon Duran (born 31 January 1987) is an ethnic Assyrian professional Austrian footballer who currently plays for Wiener Neustadt as a defensive midfielder or center back, He was born in Vienna.

Javier Mascherano: Javier Alejandro Mascherano (] , ] ; born 8 June 1984) is an Argentine professional footballer who plays as a defensive midfielder or centre-back for Spanish club FC Barcelona and the Argentina national team.

Aliou Cissé: Aliou Cissé (born 24 March 1976) is a Senegalese football coach and former player.  He has previously played for English Premier League club Birmingham City and later Portsmouth.  Cisse was a defensive midfielder who has, on occasion, played at center back.

Alberto Dualib: Alberto Dualib (born 1920 in São Paulo, Brazil) is a Brazilian businessman of Lebanese descent.  Alberto Dualib was Sport Club Corinthians Paulista's chairman between 1993-2007.  He worked with: Nesi Curi, Clodomil Antonio Orsi, Wilson Bento, Aurélio de Paula, Osmar Stábile, Antonio Jorge, Rachid Junior, Emerson Piovezan, Farid Zablith Filho, Jorge Agle Kalil, Francisco Teocharis Papaiordanou Jr., Ílton José da Costa, Paulino Tritapepe Neto.  He, as the club chairman, made a contract with Media Sports Investments, controlled by Kia Joorabchian, and with the russian oligarch Boris Berezovsky as one of its investors. Renato Duprat is his right-arm. With MSI's aid, Dualib contracted many stars for Corinthians, like: Carlos Tevez, Nilmar Honorato da Silva, Javier Mascherano, Marcelo Mattos, Roger, Gustavo Nery, Carlos Alberto and others.

Michał Pazdan: Michał Pazdan (, born September 21, 1987 in Kraków) is a Polish footballer who plays as a center back and defensive midfielder.

Fotis Kezos: Fotis Kezos (born July 25, 1995) is a Cypriot-Greek professional footballer who plays as a Center back for Leeds United.  He is a Cyprus U-19's international.  He can also play as a Defensive midfielder.

Bang Seung-hwan: Bang Seung-Hwan (born 25 February 1983) is a South Korean football player who currently plays for Navy.  He is a versatile player who can play both center back, defensive midfielder and striker based on his physical capability and football sense.

Jairo Palomino: Jairo Fabián Palomino Sierra is a Colombian football defensive midfielder that can also play left back and center back.  He currently plays for Atlético Tucumán.

Ceyhun Gülselam: Ceyhun Gülselam (born 25 December 1987) is a Turkish professional footballer who currently plays as a center back and defensive midfielder.  He plays for Kardemir Karabükspor.

Supporting paragraphs: Alberto Dualib Javier Mascherano
Answer: Javier Mascherano