He finished as the 10-goal top-scorer in the Honduras Apertura, earning him a move to Poland.
And, since joining Belchatow, Costly has netted 11 goals in 37 appearances, as well as adding to his international haul of six goals in 22 appearances.
"Carlos has a smashing pedigree, especially with the Honduran team," said McLeish.
"In recent times they have taken some fantastic scalps, including a result against Mexico, and Carlos is a key figure.
"He is a target man-type striker who is hungry and has loads of bottle. He has channelled aggression and wants to get in where it hurts."
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