It’s been reported what he’s said -
“During a meeting with the midfielders’ unit of players, of which I was not present, MS [Sampson] used an analogy about pressing hard in midfield and getting a caution like a police caution. MS then addressed the player individually and said in relation to being cautioned by police: ‘Haven’t you been arrested before? Four times isn’t it?’”
Dave Reddin, head of performance, as part of an information-gathering exercise last year, added: “This comment about the player was made with derogatory, racial and prejudicial connotations.
“It was also a defamatory, untrue statement given that the player has never been arrested and MS’s comment indicates an assumption (subconscious or conscious) that being mixed race from London suggests a criminal record with the police.
“Although I was not present at the meeting, other players confirmed MS made this comment. Other players confirmed the comment was not received as a joke and created an awkward atmosphere in the room. I was deeply concerned about this comment and felt it was highly inappropriate for the national team coach to make such a sweeping negative generalisation about a new player in the team.”
https://www.google.co.uk/amp/www.telegraph.co.uk/football/2017/08/16/mark-sampson-accused-remark-racial-prejudicial-connotations/amp/
“We were in the hotel. Everybody was excited. It was a big game. On the wall, there was a list of the family and friends who were coming to watch us and I just happened to be next to Mark. He asked me if I had anyone who would be there and I said I had family coming over from Nigeria. ‘Oh,’ he said. ‘Nigeria? Make sure they don’t bring Ebola with them”
https://www.theguardian.com/football/2017/aug/21/eni-aluko-england-manager-mark-sampson-ebola
He’s been sacked for inappropriate conduct at Bristol that became more apparent to the FA after investigating the Aluko claims anyway, so it’s totally irrelevant.