Dundee United trial French striker
Thomas is looking for a new club after being released by Kaiserslautern at the end of last year.
The 20-year-old has been training with United and Tannadice boss Craig Levein says he will continue to look at him in pre-season.
"He is just a young boy but we have brought him here for 10 days to have a look at him," Levein told The Courier.
"So we will have a look at him just now and then probably bring him back for another shot at it over the summer."