ST. LOUIS -- The Cardinals have filled their most pressing vacancy, and it has nothing to do with the active roster or the field staff.

St. Louis will name Dan Kantrovitz, currently in the Oakland Athletics' front office, as its new director of amateur scouting. Kantrovitz fills the void created when Jeff Luhnow departed to become Houston Astros general manager.

The St. Louis Post-Dispatch first reported Kantrovitz's hiring in a Wednesday story. A baseball source confirmed the move to MLB.com on Wednesday evening. The club has not announced the move, and neither Kantrovitz nor Cardinals general manager John Mozeliak could be reached for comment on Wednesday.

Kantrovitz, 33, played briefly in the Cardinals organization before an injury derailed his playing career. He was a 25th-round selection in the 2001 Draft and played in one game for rookie-level Johnson City. A St. Louis native, he attended Brown University in Rhode Island.

Kantrovitz has previously worked in the Cardinals organization, serving as director of college scouting after his playing career and also working as an intern with the club while he was in college. He has most recently worked as director of international scouting for Oakland.

Luhnow spent eight years with the Cardinals, working for a while as the farm director as well as scouting director. He was hired by Houston in early December to replace Ed Wade.

Sig Mejdal, who had been the Cards' senior quantitative analyst, also recently departed to work for Luhnow in Houston. Mejdal will be the Astros' director of decision sciences.

Luhnow's departure was one of three major changes in the organization since the season ended. Manager Tony La Russa retired shortly after the season ended, and superstar first baseman Albert Pujols signed with the Angels as a free agent.

The A's promoted Sam Geaney to the position of coordinator of international scouting. He previously served as a coordinator in the scouting department, a scouting assistant and video coordinator.