The Los Angeles Chargers, owned by the Spanos family, is in advanced talks with two buyout firms to offload a stake. The Miami Dolphins, owned by real estate billionaire Stephen Ross, are also in talks with private equity firms as well as a number of potential individual buyers.

Former Chelsea manager Mauricio Pochettino was hired this week to run the U.S. squad, a move that the national soccer federation said was “supported in significant part” by a gift from Ken Griffin, the billionaire founder of the Miami-based Citadel financial empire.

Sports investing has boomed in the past few years. One of those leading the charge is Ian Charles of Arctos Partners, a firm that raised over $4 billion for its now-closed Arctos Sports Partners Fund II.

Former NFL safety and kick returner Brandon Wilson and former sports broadcast journalist Rashad Johnson have joined the Louisiana-based advisory firm WFA.

Such outside investment can provide NFL team owners with liquidity as some look to cash in on the ever-rising team valuations or fund projects such as building new stadiums.

During a special one-day league meeting in Minneapolis, the National Football League loosened some of the strictest ownership rules in professional sports to allow private equity to own as much as 10% of a team.