McLeish's former club's rivals, Celtic were trying to sign the defender last Summer but talks fell through between the two parties.
McLeish has since realised what Celtic saw in the versatile centre half and it looks as though he will try bring the Czech international to St. Andrews in the new year.
It is thought that Alex McLeish went to Prague himself earlier in the week to speak with the player personally.
While there, the former Scotland manager saw Kadlec feature for Sparta and he must have been impressed. The home side were three one victors with the scouted player bagging the last goal.