Career
Lavanini plays for the Jaguares, Argentina"s new entry in the Super Rugby, competition started during the 2016 season. He represented Argentina Under 20 in the 2013 Institutional Review Board Junior World Championship. He made his senior debut for Los Pumas against Uruguay in April 2013 and was subsequently called into the squad for the 2013 Rugby Championship as injury cover for Manuel Carizza where he made his championship debut as a 74th-minute substitute in his side"s 17-22 defeat to South Africa on 24 August.
Tomás was part of the national team that competed at the 2015 Rugby World Cup.