With training camps set to open on July 28, 72 National Football League players have tested positive for COVID-19 as of July 10, the league's players union confirmed Thursday. 

It was not immediately clear who were the infected players or which teams they play for, and how many of the league's roughly 2,900 rostered players had been tested or how often. 

The test results come as the NFL and NFLPA are locked in negotiations over the terms and conditions of pre-season training and exhibition games, including how to classify a player's potential positive coronavirus diagnosis. 

The NFL plans to move forward with its regular season kickoff on September 10, with fans not allowed to attend training camps, as the league finds a path forward amid the coronavirus outbreak. 

Players have requested more time to address fitness concerns and want no pre-season games in August. 

Houston Texans star J.J. Watt said on Thursday that players remained in the dark over several key details concerning COVID-19's impact on the upcoming season. 

"We don't know if there are pre-season games or not, we don't know if there will be daily testing, semi-daily testing etc," Watt wrote on Twitter. "We don't how a potential positive COVID test would affect contracts, roster spots, etc." 

Watt added that he had also not seen an infectious disease emergency response plan from either the NFL or any team. 

(With input from agencies)