Noni Madueke and Nicolas Jackson clashed at 4-0 over who should take the spotkick won before designated taker Palmer stepped up.
After the 6-0 win against Everton, Palmer shrugged off the row, stating: "Other players wanted to take it which is understandable with the game at 4-0.
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"But I'm the penalty taker and I wanted to take it so in the end I took it.
"I think we are just trying to show everyone that everyone wants to take responsibility and stuff like that. Maybe it was a bit over the top with the arguing and stuff but everyone wants to win, help and stuff so it is nothing major.
We were laughing and joking about it. The gaffer has told us now."