The world's second-richest person went to the locker room after Leon's 2-0 win over Club America on Thursday and gave the players iPads and iPhones.
On Thursday evening, the 73-year-old telecommunications entrepreneur, who is part of Leon and Pachuca's ownership team, was present at the Estadio Leon supporting his side during the 2-0 win over Club America.
Afterward, Slim went down to the locker room to hand out presents to the team.
"He just congratulated us for the campaign," said midfielder Carlos Pena to Mediotiempo.com. "He brought us a little something, nothing more; an iPad and an iPhone."
Added Pena: "He told us he'd brought us something, but we shouldn't lose focus for the final."
The business magnate bought a 30 percent stake in Pachuca and Leon through his company America Movil back in August 2012, shaking up the Mexican domestic game shortly after when it was announced that Leon's home games would be shown on Fox and specific websites, not on the usual Televisa and TV Azteca owned channels.
"(The visit) is special because he is one more member of the team, one of the owners and to receive the support, motivation and words he gave us at the end of the game brought us a lot of pride," said Leon coach Gustavo Matosas in the postgame press conference.