ESPN's Pedro Gomez details the events that lead to Major League Baseball investigating how medical information was disclosed by the Padres in trades with the Marlins and Red Sox. (1:43)

Recent trades by the San Diego Padres are drawing scrutiny within the industry about whether the Padres properly shared relevant medical information in trades executed with the Boston Red Sox and Miami Marlins, according to league sources.

Major League Baseball is aware of the concerns and reviewing the exchanges, though it is unclear whether the Padres face specific penalties or reprimand. The Marlins have received a remedy already, and the Red Sox are not seeking remedy or an alteration of their deal, sources say. Right-hander Colin Rea was returned to the San Diego Padres after he left his first start with the Miami Marlins because of injury. Steve Mitchell/USA TODAY Sports

Sources said Padres executive Ron Fowler is aware of the MLB review. A team spokesperson said the organization has no comment at this time.

The examination of the Padres' moves has led to a larger conversation about establishing clear and written protocol for what medical information MLB teams must disclose as they prepare trades.

In July, the Red Sox swapped star pitching prospect Anderson Espinoza for Drew Pomeranz, a left-hander named to the National League All-Star team earlier this year. According to sources, the Red Sox have become aware of medical information with Pomeranz that they believe was not properly disclosed during trade talks.

Teams are generally expected to reveal all necessary medical records as deals are executed to provide as complete a picture as possible for a team acquiring a player. Medical review of all players involved in any proposed deal is a standard part of the process.

Last week, the Padres traded pitchers Colin Rea and Andrew Cashner to the Miami Marlins for a package of players that included prospect Luis Castillo. In the fourth inning of Rea's first start with the Marlins, he had to come out of the game because of an elbow problem, and according to sources, Rea informed the Marlins' staff that his discomfort dated to his time with the Padres and he had been previously treated. Sources said the Marlins maintain that they were not aware of this at the time the trade was executed.

Two days later, with the Marlins angry about Rea's injury, he was returned to San Diego in a swap for Castillo.

The Padres said Friday that Rea will have season-ending Tommy John surgery on his right elbow.