Commissioner Roger Goodell said the NFL will re-examine policies regarding head-coach diversity in the league, saying its efforts have yielded “unacceptable” results.

In a memo sent to all 32 teams Saturday morning, he also said matters involving “the integrity of the game” must be addressed.

Goodell’s memo comes days after former Miami Dolphins head coach Brian Flores sued the NFL, charging an interview he had with the New York Giants was a “sham” intended to meet diversity hiring rules. Flores also alleged he had been offered money by Dolphins owner Stephen Ross to intentionally lose games to secure a better draft position.