Sinclair's attitude was questioned by Mel last month.
But when asked if the Manchester City man had responded as hoped, Mel was surprisingly positive.
"Yes I am very happy. He is an intelligent and professional player," he said.
"When I arrived here he wasn't playing all that much, he wasn't always getting into the squad.
"He's been slightly unfortunate in that the games in which he's come on, things haven't work out well for him.
''But he's definitely got a future ahead of him. We're all playing for our futures in the next six games."
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