Ex-Leeds man gives his verdict on the club's game with QPR.
Leeds United were held to a 1-1 draw at home to QPR, after conceding a late penalty courtesy of a Giuseppe Bellusci error.
Whelan told BBC Radio Leeds: "I don't understand why people make these decisions knowing that any type of contact could result in the penalty.
"A decision from Bellusci has cost us again. It comes to these crucial moments when you look for professionalism, game management, and he lets himself down, and his teammates down.
"I really think without that penalty they (QPR) would not have scored in free play."
Chris Wood scored the opening goal in the 70th minute, his ninth goal of the season latching onto a ball into the box from Luke Murphy, who was selected in front of January signing Toumani Diagouraga.
Up until that point the game had been low on talking points, and had seemed to be heading for a goalless draw.
Bailey Peacock-Farrell was selected in goal for the fixture in for the suspended Marco Silvestri, and had a chance to become a hero late on, but could not save substitute Tjaronn Chery's penalty.
Leeds had kept Giuseppe Bellusci in the starting line-up despite his costly error against Rotherham United at the weekend, with Sol Bamba left out, and it was the Italian who gave away the 87th minute penalty.
Steve Evans had selected two wingers in Stuart Dallas and Mustapha Carayol, which to the frustration of fans he has for one reason or another been reluctant to do so this season.
The match saw Jimmy Floyd Hasselbaink return to Elland Road as a manager for the first time since his brief but impressive spell as a player in the late 90s.