"Have it on good authority from entertainment sources that 'former teammate' in Tony Parker-Eva Longoria affair is Brent Barry," Graham tweeted.
He added that the Barrys are also going through a divorce.
When contacted by Radar Online, Erin's brother Casey refused to confirm Erin's involvement.
"When we are ready to speak about this, we will contact the press," he said.
Longoria, 35, filed for divorce from Parker, 28, in a Los Angeles court on Wednesday morning, November 17 citing "irreconcilable differences."
"It is with great sadness that after 7 years together, Tony and I have decided to divorce," the Desperate Housewife star Tweeted.
"We love each other deeply and pray for each other's happiness."
Longoria later confirmed the news to Extra host Mario Lopez.
According to Lopez, Eva found hundreds of texts on Tony's phone from the wife of one of his teammates.
Eva also told Lopez that Tony cheated on her earlier with another woman; he kept in touch with the woman through Facebook.
"She is devastated; she wants us all to know that. But she's strong," Lopez says.
According to TMZ, Eva has sought spousal support.
Brent Barry's Wife Involved In Divorce
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