New Delhi, July 25 -- When former Real Madrid goalkeeper Keylor Navas got an offer to play in Mexico for UNAM Pumas, he knew who to ask for advice.

The Costa Rica goalkeeper called his ex-Madrid teammate Sergio Ramos, as well as Costa Rica coach Miguel Herrera, before he eventually agreed to join Pumas in the top-tier Liga MX on a reported one-year contract. The move follows a six-month stint in Argentina with Newell's Old Boys.

The 38-year-old Navas was introduced on Thursday as the Mexican side revamps its roster to try to end a 14-year spell without winning a league title.

"I'm here eager to give my all, to push myself, and to be on the pitch playing at my best," Navas said. "I have the mentality to make history, to be able to win a...