You are talking absolute nonsense. The club didn't disclose the fee paid for ANY of the players you mention, and it certainly isn't included in the profiles on the official website.
Have you been drinking?
In case you hadn't noticed, the club virtually never discloses the fee paid for a player these days; there is nothing special about Skalak's transfer in that respect.
However, sources in the Czech Republic put the figure at 1.7million euros, which is about £1.28 million (at the prevailing...