| 31 Aug 09 | N. Bianchi Arce Nicolas Bianchi Arce |  San LorenzoSLO | → |  AEK AthensAEK | Loan |
| 28 Aug 09 | S. Luna Sebastián Luna |  QuilmesQUI | → | San LorenzoSLO | Undisclosed |
| 27 Aug 09 | V. Meza Victor Meza |  Sportivo ItalianoSportivo Ita | → | San LorenzoSLO | Undisclosed |
| 24 Aug 09 | G. Bergessio Gonzalo Bergessio | San LorenzoSLO | → |  Saint-EtienneASSE | 7800000 |
| 24 Aug 09 | G. Bergessio Gonzalo Bergessio | San LorenzoSLO | → | Saint-EtienneASSE | 7800000 |
| 14 Aug 09 | L. Romagnoli Leandro Romagnoli |  Sporting CPSCP | → | San LorenzoSLO | Undisclosed |
| 13 Aug 09 | G. Campagnuolo Gustavo Campagnuolo |  Racing ClubRAC | → | San LorenzoSLO | Undisclosed |
| 11 Aug 09 | C. Tula Cristian Tula | San LorenzoSLO | → |  Arsenal SarandiARS | Undisclosed |
| 06 Aug 09 | N. Silvera Néstor Silvera | San LorenzoSLO | → |  IndependienteIND | 650000 |
| 06 Aug 09 | C. González Kily González |  Rosario CentralROS | → | San LorenzoSLO | Undisclosed |
| 31 Jul 09 | P. Alvarado Pablo Alvarado | San LorenzoSLO | → |  Belgrano (Córdoba)BEL | Loan |
| 29 Jul 09 | H. Peirone Hernán Peirone | San LorenzoSLO | → |  EmelecEME | Undisclosed |
| 27 Jul 09 | P. Pintos Pablo Pintos |  Defensor SportingDSC | → | San LorenzoSLO | 700000 |
| 24 Jul 09 | P. Migliore Pablo Migliore | Racing ClubRAC | → | San LorenzoSLO | Loan |
| 23 Jul 09 | C. Leiva Cristian Gustavo Leiva |  Godoy Cruz Antonio TombaGCM | → | San LorenzoSLO | Undisclosed |
| 23 Jul 09 | J. Menseguez Juan Carlos Menseguez |  West Bromwich AlbionWBA | → | San LorenzoSLO | Free |
| 23 Jul 09 | J. Menseguez Juan Carlos Menseguez | West Bromwich AlbionWBA | → | San LorenzoSLO | Free |
| 19 Jul 09 | H. Navarro Hilario Navarro | San LorenzoSLO | → | IndependienteIND | Free |
| 18 Jul 09 | S. Solari Santiago Hernán Solari | San LorenzoSLO | → |  AtlanteATL | Undisclosed |
| 18 Jul 09 | S. Solari Santiago Hernán Solari | San LorenzoSLO | → | AtlanteATL | Undisclosed |
| 17 Jul 09 | A. González Adrián González | San LorenzoSLO | → |  São PauloSAO | Undisclosed |
| 17 Jul 09 | A. González Adrián González | San LorenzoSLO | → | São PauloSAO | Undisclosed |
| 17 Jul 09 | C. Chávez Cristian Chávez | San LorenzoSLO | → | Godoy Cruz Antonio TombaGCM | Loan |
| 13 Jul 09 | Félix Orode | SFXSkarks FCSkarks FC | → | San LorenzoSLO | Undisclosed |
| 08 Jul 09 | S. Méndez Sebastián Méndez | San LorenzoSLO | → |  BanfieldBAN | Loan |
| 07 Jul 09 | P. Barrientos Pablo Barrientos | San LorenzoSLO | → |  CataniaCAT | Undisclosed |
| 07 Jul 09 | P. Barrientos Pablo Barrientos | San LorenzoSLO | → | CataniaCAT | Undisclosed |
| 01 Jul 09 | C. Ledesma Cristian Ledesma | San LorenzoSLO | → |  OlympiakosOLY | Free |
| 01 Jul 09 | B. Fornaroli Bruno Fornaroli | San LorenzoSLO | → |  SampdoriaSAM | Free |
| 01 Jul 09 | J. Santana Jonathan Santana | San LorenzoSLO | → |  VfL WolfsburgWOB | Free |
| 01 Jul 09 | J. Santana Jonathan Santana | San LorenzoSLO | → | VfL WolfsburgWOB | Free |
| 01 Jul 09 | B. Fornaroli Bruno Fornaroli | San LorenzoSLO | → | SampdoriaSAM | Free |
| 11 Mar 09 | H. Navarro Hilario Navarro | IndependienteIND | → | San LorenzoSLO | Loan |
| 10 Feb 09 | B. Fornaroli Bruno Fornaroli | SampdoriaSAM | → | San LorenzoSLO | Loan |
| 10 Feb 09 | B. Fornaroli Bruno Fornaroli | SampdoriaSAM | → | San LorenzoSLO | Loan |
| 03 Feb 09 | P. Gómez Papu Gómez | Arsenal SarandiARS | → | San LorenzoSLO | 2,000,000 |
| 02 Feb 09 | J. Menseguez Juan Carlos Menseguez | San LorenzoSLO | → | West Bromwich AlbionWBA | Loan |
| 02 Feb 09 | J. Menseguez Juan Carlos Menseguez | San LorenzoSLO | → | West Bromwich AlbionWBA | Loan |
| 27 Jan 09 | J. Santana Jonathan Santana | VfL WolfsburgWOB | → | San LorenzoSLO | Loan |
| 27 Jan 09 | J. Santana Jonathan Santana | VfL WolfsburgWOB | → | San LorenzoSLO | Loan |
| 24 Jan 09 | S. Hirsig Santiago Hirsig | San LorenzoSLO | → |  Barcelona SCBAR | Undisclosed |
| 12 Jan 09 | J. Bottinelli Jonathan Bottinelli | SampdoriaSAM | → | San LorenzoSLO | Loan |
| 12 Jan 09 | J. Bottinelli Jonathan Bottinelli | SampdoriaSAM | → | San LorenzoSLO | Loan |
| 02 Jan 09 | W. Acevedo Walter Acevedo | San LorenzoSLO | → | TMXTorpedo MetalistTorpedo Metalist | 1.500.000 |