The interim Swans manager retained just three players from the side that drew 1-1 with Stoke City in the Premier League during the week and it proved to be a gamble as the Welsh side crashed out of the cup competition.
But Monk said it was a necessary move to rest some of his players after a hectic couple of weeks as he looks forward to the February 20 Europa League Round of 32 clash with Napoli.
"When you have got seven games in 21 days, it is impossible to play the same 11 in every game," he said.
"I can only judge the boys on the week I have had and their attitude has been magnificent, every one. From the first day, I said everyone would play and I was true to my word.
"It is a squad game. Everyone seems to be amazed when there are rotations.
"With Europe, you have to have that rotation. Every side I pick is a team to try and win the game."
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