Gardner waxed lyrical about his colleague and admitted he's delighted to see Fletcher doing well at Sunderland.
After the game at the DW Stadium, Gardner told safc.com: "He's just showed why he's worth the money that was paid for him.
"To have scored 10 goals at this point in the season is phenomenal.
"If someone like [Wayne] Rooney, [Lionel] Messi or [Robin] van Persie had scored those goals you would never stop hearing about them for months.
"I wish Fletch would get the same recognition because he's different class."