Brookfield Asset Management is considering a €6.45 billion ($6.9 billion) bid for Grifols SA, with the drug maker’s board set to meet Tuesday to discuss the potential offer. Grifols’s shares fell.

Grifols said on Tuesday that Canadian investment fund Brookfield's potential 6.45 billion euro ($6.8 billion) offer significantly undervalued the Spanish drugmaker's prospects and long-term potential,

Grifols SA’s board recommended that shareholders reject Brookfield Asset Management’s indicative offer, which values the Spanish drugmaker at €6.45 billion ($6.8 billion).