Wigan chairman Dave Whelan confirmed that a compensation package has been agreed with Everton for the services of Martinez.
He told BBC 5Live on Monday night: 'I agreed terms with the chairman at Everton, Bill, about 6 o'clock this evening. Bill and myself have sorted out the compensation and Roberto is free to do a deal with Everton now if he wants.
'I gave Roberto permission to speak to Everton last week.
He came back and told me it had gone well, I think he was down to the last two or three on the list, and then their chairman rang me to discuss the compensation deal and we agreed that this evening. It sounds like he'll be the next Everton manager but, football being football, sometimes you can be wrong.
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