The FA will take no action against Malky Mackay and Iain Moody for their part in a string of abusive texts sent during their time at Cardiff City.
After an eleven month investigation, the governing body concluded that "the communications were sent with a legitimate expectation of privacy", inferring the texts were not meant to be seen by outside parties.
But both men have been spoken to "about the inappropriateness of terms used in the messages", with Mackay voluntarily taking a course teaching about equality in the game.
The FA, in their statement, highlighted concerns over how the texts were brought to light and whether the pair's right to privacy had been breached.
"The nature of these concerns, which the FA treats with the utmost seriousness, has necessitated significant further inquiries by the FA and the liaison with external law enforcement agencies," it said.
Mackay was sacked as manager by Cardiff in December 2013, having guided the side to the Premier League for the first time the previous season.
His only job in football since the investigation was a short stint at Wigan, who were relegated from the Championship last season. The controversy over his appointment was compounded by comments made by then Wigan chairman Dave Whelan, who made offensive comments about Jews and Chinese people.
Whelan resigned as chairman at the end of the season and handed control of the club over to his grandson.
Following his exit from Cardiff, Moody took up a similar position at Crystal Palace, but after the allegations were made public in August by Cardiff, Moody resigned his position.