A 92nd-minute converted try sealed the 26-27 victory for the Welsh side in the final round of the 2022/23 Heineken Champions Cup pool stages and, while already qualified for the Round of 16, Wigglesworth said it didn't feel like success in the home changing room.
"Desperately disappointed," replied Wigglesworth.
"We did a lot of good stuff tonight but the result was of our own making."
Speaking about the match, the Tigers Head Coach said it was a case of ill-discipline which ultimately decided the result.
"We opened the door for them to come back and win it, only six points ahead, against a good team in the top tier of Europe," he said.
"If you give penalties away in field position, you are going to lose games."
Qualified for the knockout stages before kick-off was never on the mind of Tigers according to Wigglesworth, who said each game was about performing and winning - anything beyond that was never a focus for his side.
"It was never a case of living or dying on the fact we could secure a home knockout game, we always want to go out and perform and win," Wigglesworth said.
"We were in a position to win tonight and couldn't get that over the line. The result is our making."
Expanding on the atmosphere among his players and coaches, he added: "Through to the knockout stages of Europe is a great achievement and we've done some special things in this campaign, made some great memories."
"But, while we probably would have taken that at the start of the tournament, it doesn't feel like success tonight. We play to win and didn't win tonight."