Vallejos has represented Argentina in the U17, U18, U20 and U23 age groups, and won his first senior cap as a replacement at the 2011 Rugby World Cup against Georgia.
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Vallejos Cinalli signed for English side Harlequins during the 2009-10 season to fill the gap left by the injured Jim Evans.
University of Santo Tomas | Tomás Luis de Victoria | Tomáš Garrigue Masaryk | Santo Tomás District | Tomas Leandersson | Santo Tomás District, Chumbivilcas | Tomas Venclova | Tomas Haake | Tomás Arias | Rector Magnificus of the University of Santo Tomas | Tomás Maldonado | Tomáš Bezdeda | Tomas Arana | Santo Tomás District, Luya | University of Santo Tomas College of Education | Tomás Taveira | Tomas Lindberg | Tomás Gutiérrez Alea | Tomás Eloy Martínez | Tomás de Torres | Tomás de Iriarte y Oropesa | Tomás de Bhaldraithe | Tomas Alfredson | Tomas | Santo Tomás | University of Santo Tomas Field | University of Santo Tomas Faculty of Medicine and Surgery | University of Santo Tomas Faculty of Civil Law | University of Santo Tomás | Tomas Osmeña |