The Czech striker suffered a broken leg not long after initially signing for Aston Villa.
The Aston Villa boss was linked with the Leeds star when manager at Premier League Hull City.
The Leeds manager was under pressure after losing to Hasselbaink's QPR on the opening day of the season.
The Polish international has been linked with potential loan deals in the Championship.
The 17-year-old has been in fine form for the Nottingham Forest under-23s.
However, the Leeds United star then thought the ball would end up in the back of the net.
The Liverpool boss says he knew how big a club Leeds are thanks to their former midfielder.
The Frenchman has shown good spirit to return from a serious knee problem.
Leeds United lost 2-0 to Liverpool in the quarter-final tie at Anfield.
The former Wolves midfielder is happy with the appointment of Lambert at Molineux.