The 26-year-old Czech striker put in a committed display on his first Premier League start since December 2013 to help Remi Garde's men secure a 1-0 home win.
Leeds United were beaten 2-1 by Ipswich Town yesterday.
The 20-year-old is one of the highest-rated prospects in Europe currently.
Manchester United could only draw 3-3 with Newcastle United on Tuesday evening.
Libor Kozak has made just three appearances for Aston Villa since the start of 2014.
Wolverhampton Wanderers beat Fulham 3-2 at Molineux on Tuesday night.
Aleksandar Mitrovic scored in Newcastle United's 3-3 draw with Manchester United.
Sebastian Polter has been a key part of Jimmy Floyd Hasselbaink's preferred team at Queens Park Rangers so far.
The Celtic winger is just what Leeds United need and his long-term future remains unclear.
Tottenham fans are hoping old boy Steven Caulker can get one over on Arsenal if he makes his debut for Liverpool while on loan from QPR.