Hlozek has been watched by pretty much every top European club over the past three years.
He has a contract until June 2022 with the club currently third in the Czech league table
He has scored four goals and made six assists this season from just seven appearances this season before a serious injury halted things.
Hlozek suffered from a metatarsal fracture back in October but is due to return to action in March and just the kind of young, hungry player David Moyes wants to sign.
The injury may have put off the likes of Manchester United but West Ham are still battling to bring in their third Czech player.