Rotherham have secured Eugen Bopp's services until the end of the season.
The German midfielder was handed a short-term contract at the beginning of August after impressing in a pre-season trial, and his good form has continued.
He has played in all five of The Millers' League One games so far this term and grabbed a goal against Scunthorpe.
The 22-year-old is now looking forward to the rest of Rotherham's campaign and hopefully helping them out of the relegation zone.
"I am really happy here," Bopp told the club's official website.
"There's a great bunch of lads here and I am looking forward to the rest of the season and climbing further up the table."