Carayol joined Leeds from Championship rivals Middlesbrough last week on loan until the end of the season.
The 27-year-old winger made a memorable debut for Leeds, scoring the opening goal of the encounter on the stroke of half time as they won 2-0.
Wood did not feature in the tie as he is injured at the moment, and former Leeds striker Whelan believes that the New Zealand international will be happy with Carayol’s performance against Rotherham.
“Carayol has shown he can do both sides to his game,” Whelan told BBC Sport. “He’s been really effective crossing into the area.
“He seems to naturally put it in the right place. He doesn’t pick out a man because if you put it in the right area, you’ll expect a man to be there.
“Chris Wood will have been watching this and rubbing his hands together. He’ll be looking forward to getting on to some of those crosses.”
Carayol has been on the books of Middlesbrough since 2012 and has a contract until June 2017.
The winger was on loan at Huddersfield Town for the first half of the 2015-16 campaign. The former Lincoln City man scored three goals and created 25 chances in 15 Championship appearances for the Terriers.