The 22-year-old had an impressive season as Motherwell finished second in the Scottish Premier League and qualified for a Europa League preliminary spot and
Lech Poznan are understood to be the Polish club interested.
Motherwell chief executive Leeann Dempster admits the Fir Park club anticipated interest in the Estonia international, but insists it will take a substantial offer to acquire his services.
Dempster said: "We understand there is likely to be a considerable amount of interest in Henrik given just how well he has performed since arriving at the club in January 2012.
"He scored five goals in his first seven matches after joining the club and created more goals than any other player in the Scottish Premier League last season; that obviously hasn't gone unnoticed.
"However, the bid we have received does not match our valuation of the player."