Fire back up the NFL return rumors for Rob Gronkowski ... after he was cut from "The Masked Singer" Wednesday, he refused to close the door on his football career once again!!
Gronk had been participating on the blind singing show this season ... and it was pretty damn obvious the former Patriots tight end was rockin' the "White Tiger" outfit the whole time.
His dance moves -- even in full costume -- were very Gronk-esque ... there was plenty of twerking, flossing and overall spasming on the stage weekly!!
Surprisingly, only two of the judges were able to correctly guess it was him .