The 30-year-old attacker joined Olympiacos in the January transfer window on loan until the end of the season, with his long-term future at Goodison Park hanging in the balance after being criticised by Toffees fans.
His future has been speculated about since his move back to Olympiacos, where he first joined Everton from just over six years ago. Now, the 59-time international looks set to return their permanently.
This comes after posting on his Instagram story a message that read: "Stop talking about my future. Only Olympiacos."
The Toffees decided to offload Mirallas after ostracising him from the first team. The signing of Theo Walcott in January pushed him down the pecking order, with Yannick Bolasie, Gylfi Sigurdsson and Nikola Vlasic also used out wide.
Since his move back to the Greek giants, Mirallas has scored one goal in 12 appearances in a side that are struggling to recreate their excellent form of last season. They sit in third place, six points behind leaders AEK Athens.
It remains to be seen if a permanent move to Olympiacos is sanctioned, with two years remaining on a contract worth £70,000 a week according to the Daily Star.