"I am missing my family and my friends, I don't know anybody to talk to in England, and the manager does not even notice my hard work in training. I am ignored.
"I was a king at Fenerbahce, I was the captain of the side and a favourite of the fans. Now, in the Premier League - I'm a substitute."
When the Turk was recalled, against West Ham last Saturday, he missed a hat-trick of chances as Southgate's men went down 3-0.
That compounded the miserable time Tuncay has had since his switch and he poured out his feelings when meeting up with the national side last week.
He told his former team-mate: "I have been working hard during practice sessions but this doesn't seem to matter.
"I didn't expect this when I signed for Middlesbrough and the manager."