The Hammers were first linked with the one-cap Czech Republic international at the turn of the year.
Hlozek has spent the past three seasons as part of Sparta's first team, having been handed his senior debut at the age of just 16.
90min suggests that the teenage attacker, now aged 18, is continuing to attract interest from West Ham.
Hlozek has scored 15 goals in the Czech First League, five of those goals coming in 12 appearances this season.
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