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.

"He has been at Bordeaux and Kaiserslautern but hasn't played a game since they ended his contract in December so he is not fully fit.

"So we will have a look at him just now and then probably bring him back for another shot at it over the summer."