The Daily Mail have revealed they have the details of four more text messages supposedly sent by Mackay, which include the former Cardiff manager allegedly calling Vincent Tan a 'chink'.
According to the Mail, the offending text was sent from Mackay's phone on June 5 last year, when he contacted Iain Moody about a player he wanted to sign.
The text read: 'Not taking no for an answer from the chink until the 20th time or unless somebody big blows us out of the water. Can you tell him that?'
In another echange, the pair discuss a target who is being courted by a rival club. The Mail claim a message from Moody's phone to Mackay states: 'He told me he had an offer to go there but will never accept because the manager is a racist. Thankfully he hasn't met you.'
Mackay admitted to sending three "completely unacceptable" texts on Friday, when he told Sky Sports: "Out of 10,000 text messages in and out of someone's phone I sent three and that being the case, looking at them they are completely unacceptable, inappropriate and for that and for any offence I've caused I sincerely apologise for that."
He is yet to comment on these latest allegations.