SLAVIJA Sarajevo will be Derby County's second opponents of their pre-season trip to Austria.
Derby face the Bosnia & Herzegovina side on Friday, July 25, as part of a six-day training camp.
Slavija finished 13th in the Premijer Liga BiH last season.
The venue and kick-off time for the game is still to be confirmed.
Derby will also play Russian side Zenit St Petersburg on Tuesday, July 22, at SC Kalsdorf's Stadium, Sports Zentrum Kalsdorf, kick-off 6pm (5pm BST).
Zenit, managed by former Chelsea and Tottenham Hotspur boss André Villas-Boas, finished runners up in the Russian Premier League last season.
and their squad includes Brazilian international Hulk, Belgium international midfielder Axel Witsel and former Arsenal player Andrey Arshavin.
* DERBY County's Championship fixture at Blackburn Rovers in September has been put back by 24 hours.
The Rams were due to visit Ewood Park on Tuesday, September 16, but the game will now be played on Wednesday, September 17 (7.45pm).
The change has been made because Derby play Nottingham Forest on Sunday, September 14.
