Vincenzo Montella confirmed Marco Borriello was not Roma's designated penalty taker in Donetsk when his effort was saved.
David Pizarro scored the spot-kick in Lecce on Friday despite an argument with his teammate, then Borriello's was parried during the 3-0 defeat to Shakhtar.
“I always designate the penalty taker before a game. Both at Lecce and tonight it was Pizarro, but anyone who plays football knows that at times a player really feels it,” explained Montella.
“Pizarro allowed him to step up without a problem. I feel bad for Marco, so next time I'll just take the penalty!”
Qualification was already difficult after Claudio Ranieri's side lost 3-2 on home turf, but after Borriello's penalty was saved, Philippe Mexes saw red.
“Before the game I asked the lads to be consistent and improve aside from the result. In that respect I'm happy, as until we went a man down, we created a great deal and had a good approach towards a fine squad.
“We had five or six shots on goal in the first half, then the red card changed everything. In any case, I have promised not to talk about referees.”
The officials were, if anything, lenient towards Roma. Daniele De Rossi could face a trial using video evidence after he was caught on camera elbowing Darijo Srna, while Borriello and Simone Perrotta also ran risks with crunching tackles on the same player.
“In all honesty, I didn't see the elbow at the time. We must try to keep our heads in the game and not be swept up in emotion,” continued Montella.
“It can happen sometimes, but must not become the norm. I got angry with my players for getting pointless bookings and losing their heads.
“Shakhtar contributed to the tense atmosphere, but the important thing is to stay within limits. We should always leave the field with our heads held high. In terms of football, at least, we could do that tonight.
“When I took over, the team lost determination during negative moments. Instead today we were always solid and mustn't be downhearted, as we are on the right track.”
Roma immediately have a very tough test, as this weekend they face Lazio in the Derby della Capitale.
Think you know your Italian football? Share your knowledge, tips and comments to win cash prizes in OLBG's World Cup tipster competition - £10,000 to be won!