Winger Skalak moves to Millwall from Brighton
Skalak joined Brighton from Mlada Boleslav in February, 2016, and scored twice in 50 appearances.
The 26-year-old played 33 times in all competitions when Albion were promoted from the Championship in 2016/17 but found game time limited last season and made just three appearances in cup competitions.
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Hide AdAlbion manager Chris Hughton said: “Jiri is a great character, and I cannot fault his professionalism or work rate since arriving at the club.
“He has played his part in helping the club win promotion to the Premier League, and has been a brilliant player to have in and around the squad.
“We understand his desire to play regular first team football, and wish him all the very best for his future.”