The championship side was in talks with the Blues on Friday, but an agreement could not be reached in time.
Middlesbrough boss Neil Warnock said Yannick Bolasie was “complicit” in the failure of his planned loan agreement with Everton.
Everton held talks with Middlesbrough on the day the transfer period expired to move the loan to Yannick Bolasie.
“Really many things. I am disappointed that we did not get it. That’s life,” said Warnock, as reported by Teeside Live.
Bolasie posted a message in the social media saying he was “disappointed” that the move had not taken place but now Warnock has expanded the negotiations and blamed Bolasie for part of the blame.
“He was disappointed, but he bore some of the blame.
“A lot of things happened in the afternoon, it wasn’t meant to be. Yes, I am disappointed, but we will continue.
“I thought we had had him most of the day, but problems arose and we couldn’t get it over the line, it was too late.
“There were things I should have known about his problems in Everton before 4 a.m. and they were problems we couldn’t get over.
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“We tried and we finally made it, but it was too late.
When the problems were brought to our attention, Warnock said, “We tried and eventually we did it, but it was too late: “You don’t need to know that.
“I asked him why I didn’t know about it before, and he said he told his agent. I said why the agent didn’t tell us, he had talked quite a lot with Neil (Bausor)”.