Dundee United manager Peter Houston said he was unwilling to let Rudi Skacel take a penalty in their Scottish League Cup shootout loss to Hearts.
Skacel left Hearts after winning the Scottish Cup in May and trained with the Tynecastle club before joining the Arabs last week.
The Czech forward came off the bench in extra-time but as Hearts had been reduced to 10 men following Darren Barr's dismissal, they had to de-select a player. Houston chose Skacel.
"He wasn't upset," claimed Houston. "We spoke about it before. He knew about it. I wasn't going to let him take a penalty.
"I took Rudi out of it. I thought it would be best with the guys who I know taking penalties, and trust. I trust the players who were left on the park.
"I don't think it would've been fair on him. I felt there would be less pressure on the players that have been here for a while."
Callum Paterson put Hearts in front after 20 minutes at Tannadice, with Johnny Russell equalising for the hosts 10 minutes before half-time.
Extra-time couldn't separate the sides and they remained level after five regulation penalties. Marius Zaliukas converted the 13th spot kick, with Sean Dillon then firing wide to send Hearts through.
Houston added: "The biggest disappointment is not the penalty kicks. The biggest disappointment was the 120 minutes before it."