Padres General Manager A.J. Preller was suspended Thursday without pay for 30 days by Major League Baseball over a controversial trade with the Boston Red Sox.

Padres General Manager A.J. Preller. Photo by Chris Stone

The Padres had no immediate comment on Preller’s suspension, which followed an investigation into the July 14 transaction in which pitcher Drew Pomeranz was sent to the American League team, according to a statement from the commissioner’s office.

According to previous reports, Red Sox officials discovered after the trade that Pomeranz had been receiving medical treatment, and that the Padres had not been fully entering player health data in a central database, which would give them an advantage in trade talks.

Pomeranz was an All-Star for his strong first half of the season in San Diego, but has compiled a won-loss record of 2-5 in 11 starts in Boston, with an earned-run average of 4.60.

The trade was one in a flurry before baseball’s nonwaiver trading deadline in which Preller tried to remake a faltering organization and inject talented youth into the minor league system. The Padres also made a splash with several signings of international players.

Pitcher Colin Rea, who was sent to Miami in July in a multi-player deal, was returned to the Padres after he suffered an elbow injury in his first start with the Marlins. The Padres had to give up Luis Castillo, a prized minor league pitcher considered to be a top acquisition in the trade.

Preller was previously suspended while working as the head of international scouting for the Texas Rangers, for talking to an agent about a player suspended for lying about his age and identity. He’s completing his second season as the Padres’ GM.

Early reaction locally and around the league:

— City News Service contributed to this report.