Radar has learned the 23-year-old model has scored powerhouse lawyer Gloria Allred to represent her against the NBA star.
In a statement obtained by Radar, Allred fires back at Tristan's allegations that Sydney isn't telling the truth about their alleged fling, and says her client has receipts to prove the hookup happened.
Making the bombshell announcement, Gloria's firm said, "Our client, Sydney Chase, is outraged at what she regards as false statements that have been made about her in the media by Tristan Thompson’s representatives. She has retained my law firm, Allred, Maroko & Goldberg, to represent her and to conduct a full investigation which she believes will substantiate the relationship between her and Tristan Thompson."
Challenging Tristan's legal counsel on calling Sydney a "liar," Gloria said her client "would be willing to share evidence that Sydney has given us, provided that Mr. Thompson will make himself available in person to answer my questions and provide us with documents that we request."
She then came for the NBA star like the legal boss she is.
"If Mr. Thompson has nothing to hide, then we would expect that he will make himself available for questioning by me and that he will voluntarily provide the documents," Gloria's statement read, adding her client is more than willing "to be present at this meeting to answer questions and provide documents."
She's even extending the invite to Tristan's baby mama Khloé Kardashian.
"Khloe Kardashian is welcome to attend. We believe that the truth will emerge through this process. When we conclude our investigation, we will then advise Sydney regarding her legal options," Gloria ended her statement.
As Radar reported, Sydney Chase claims she hooked up with Tristan Thompson earlier this year.
He allegedly told her he was single and that Khloé wasn't his "type."