The NFL Players Association's executive board will hold a conference call Wednesday to discuss the HGH testing the league wants to implement this season.
The two sides are far apart, however, from agreeing on using the blood test for this season.
Union officials said last week they had not received data from the World Anti-Doping Agency that would make them feel comfortable with the testing. They are seeking information about the test's reliability and safety.
The NFL would be the first of the major American professional sports leagues to implement human growth hormone testing. Such testing was included in the new collective bargaining agreement, but implementation was contingent upon the union's approval of the test and an appeals process.