“I must be a critic of myself," Carvalhal added. “I took the risk and maybe I could have waited until later to put Tammy (Abraham) on.
“But if you take a risk as a manager and it comes off, you are a genius. If it doesn't happen – this is football.
“We tried everything to win. We placed a big bet and we lost the bet."
He also said: “We put Andre Ayew on in the first half on to try to help us. (Nathan) Dyer is more of a winger while Andre is more of an attacker, so we put him on near Jordan Ayew to try to make us more of a threat.
“The substitution was not about Dyer – he is playing very well.
“But we took some risks. We put Luciano (Narsingh) on at half-time and in that period we did well.
“We almost scored twice, through Luciano and then Ki (Sung-Yueng), then we took some more risks by putting Tammy on for a midfielder.
“We took all the risks today because we were not happy to be losing. We wanted to win.
“We placed a big bet – we had Tammy, Jordan, Andre and Narsingh on the pitch at the same time. When you do that you can win a lot of money or you can lose all your money.
“We knew it was possible we could change the game but also that they could hurt us on the counter-attack."