American former No. 1 tennis players Pete Sampras and Andre Agassi were both drafted into the new International Premier Tennis League on Sunday, but it only took one day for both men to admit they have very little idea what that entails.

Agassi, in particular, brought up red flags over what appears to be an unresolved scheduling gaffe about when the IPTL will actually begin play near the end of 2014 - November 20 or November 28.

If it's the former, Agassi said he won't be playing, because it would entail him missing Thanksgiving with his family, a deal-breaker.

"It's too much of a price to pay missing out on my family," Agassi said in London, where he took on Sampras in an exhibition match as part of World Tennis Day.

"My deal is pretty simple, I cannot be away for more than five days, including travel. I agreed to December dates, and somehow now it's over Thanksgiving, so we're in the process of working out how that communication broke down."

Sampras was even more in the dark about the new league, unable to tell media members what team he had been drafted by.

"I'm not sure," the 14-time Grand Slam winner said. "Ive been traveling and it's all happened in the last day or so. It's quite an endeavour."

Both players said they were told they were signed for three matches, but the IPTL's information suggests at least four.