Uwe Rösler has made two additions in personnel at the training camp in Germany.
Winger Martin Fillo and goalkeeper Daniel Müller arrived on Sunday afternoon and took part in their first training session on Sunday evening.
Fillo, 27, has been given permission by his current club FC Viktoria Plzeň to train with Brentford until this Saturday.
The Czech International has played three times for his country, in addition to appearances at youth level.
Goalkeeper Müller is now out of contract having spent two years with Bayern Munich II, with the 21-year-old standing at nearly six foot nine tall.