MILWAUKEE -- The Chicago Cubs continued with their midseason housecleaning as they announced the firing of six scouts Wednesday, including four on the professional scouting side.

The pro scouts terminated were Tom Bourque, Joe Housey, Tom Shafer and Richie Zisk, a two-time American League All-Star outfielder. The Cubs listed 16 scouts on the pro side when the season began.

On the amateur scouting side, regional crosschecker Charlie Aliano was released of his duties, as was area scout Rick Schroeder, who was responsible for seven states, all of them in the Midwest. The Cubs had 26 amateur scouts listed at the beginning of the season.

The pro scout positions are expected to be filled, according to a source. It isn’t certain whether the Cubs will just eliminate the positions on the amateur side or fill those spots as well.

The latest housecleaning comes a week after vice president of player personnel Oneri Fleita was dismissed. The Cubs also fired manager of baseball information Chuck Wasserstrom that day and moved statistical analyst Ari Kaplan from full-time employee to a consultant role.

There have been a number of moves made by new president of baseball operations Theo Epstein since he took over this winter. His higher-profile changes were to fire manager Mike Quade during the offseason, while the club also fired hitting coach Rudy Jaramillo in June.