Chopra leads the attack as City take on his former club Newcastle at St James' Park on Friday night.
Whittingham currently has 18 goals this season, 15 of those in the league, while Chopra's total is 16, with 14 of those coming in the Championship.
Steve Harper: “It’s a big night for Michael Chopra.
“I know Dave Jones from when I was at Stockport and he’ll have them fired up.
“But we got a fantastic result down there and we’ll be looking to do the same at home.
“Chops was back at the ground last week to watch and he’ll be looking to score at St James’ Park against his old team.
“It will be up to us to try to stop him. They’re a good side Cardiff and in a rich vein of form.”
Michael Chopra: "Obviously there's a bit of banter through the club but Peter has been fantastic this season. Even he's surprised at how many goals he has scored. For a midfielder to score 18 goals is incredible.
"But I believe I will finish top scorer in the League. I've always said that from day one when I came to the club that I'd score 30 goals.
"I've got 16 so I've got 14 to go. It's a shame that I couldn't get a couple when I was going through my goal drought, but I've got to kick on now.
"I watch Newcastle a lot. When the manager gives me time off and I go home, I'll watch them play.
"Obviously I take an interest in the club because it's where I was brought up, and another thing is that it's a football game and I enjoy watching games. My mates are all Newcastle fans.
"But if I'm one-on-one with the keeper on Friday, I'll be sticking it in the back of the net."