Career
He currently plays with the New Zealand team Highlanders in Super Rugby. He was called up by Rodolfo Ambrosio into the Argentina under-20 side for the 2012 Institutional Review Board Junior World Championship, and kept his position for the 2013 Institutional Review Board Junior World Championship. Díaz made his debut for the senior side in 2013 against eventual runners-up Uruguay in the 2013 South American Rugby Championship "A".
Despite only being capped three times (all from the two-tiered competition), Díaz was named in the 30-man squad for the 2013 Rugby Championship.