Reports in Spain indicated that certain individuals at the club were opposed to Jose Mourinho's recent criticism of referees.
The controversial Portuguese tactician was critical of the officiating in Real's 1-0 defeat at Levante and in their goalless draw with Racing Santander last week.
Mourinho is also serving a suspension in the Champions League for his post-match declarations about Barcelona in which he insinuated that UEFA helped the Catalans to progress past his Madrid side in the competition last season.
However, Karanka was keen to present a United front when he answered questions in a pre-match press conference leading up to Tuesday's Group D clash with Ajax.
"We are all united, but we have not been united since yesterday," he said.
"We have all been pulling in the same direction for a long time. We have always said that, we are going to work to achieve our aims and the more united we are, the easier it will be."
Karanka is confident Mesut Ozil and Sami Khedira will prove their worth at the Bernabeu against their Dutch opponents.
"They are players who were important to the team last season and I'm sure this will also be the case this year," he said.
"Players always go through good times and some not so good times. Ozil demonstrated when he came on against Rayo what a good player he is.
"Sami is coming back from an injury and will certainly be a major player for us."
Summer signing Hamit Altintop has been included in the 21-man squad although he is unlikely to feature heavily against Ajax.