The Spurs manager will wait until after this weekend'sPremier League trip to Blackburn before deciding what action to take.
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"It's being dealt with internally and we'll keep it in-house. I will be dealing with it after the weekend. We've got a game to concentrate on - we'll sort the game out, then I'll sort them out. Believe you me, it will get sorted out.
"I'm not happy, I'd be lying if I said I was happy. I didn't know anything about the trip at all if I'm perfectly truthful but it's done now and will be dealt with on Monday morning."
Keane was said to have orchestrated the trip near to Dublin, so Redknapp is likely to take a dim view if that is the case.
Keane could find himself on the bench at Ewood Park as Peter Crouch and Jermain Defoe combined well during the defeat of Manchester City on Wednesday.
Redknapp did select Keane for the defeat to Wolves - four days after the Christmas party.
"It was the Tuesday and didn't affect the result against Wolves, we worked our socks off, but it doesn't make it right," Redknapp added.
Redknapp has taken a strong anti-alcohol stance, particularly after Ledley King's arrest outside a London nightclub, and believes Christmas parties should not be on the agenda.
"They are my views on it," he said.
"They are more trouble than they are worth and it happens at every football club unfortunately. Every club has had problems with it."
The news of the party has overshadowed the way Spurs bounced back from defeat to Wolves with their performance against City, which Redknapp rated as their finest of the season.
Redknapp has also been boosted by King returning to training after a freak accident during a practice match that saw him injure his knee. The centre-back could play one of Spurs' two games over Christmas.
"He's a great player," Redknapp said. "We need him back and fit playing and he could play one game over Christmas."
Luka Modric, however, has suffered a setback in his recovery from a fractured fibula and has needed treatment on an ankle complaint, ruling him out of the Blackburn trip.
Redknapp is hoping to maintain Spurs' hopes of breaking into the Champions League.
He added: "Everyone has thrown silly points away. Had we not thrown away home games that we were not expected to lose, we could have been sitting there a couple of points off the top. It is that open.
"But Blackburn is not an easy game. They should have beaten Liverpool recently, I went to the game. Sam Allardyce is a good manager and they know what they are doing for sure."
Aaron Lennon has been in great form for Spurs and such is the progress at White Hart Lane this season, Redknapp feels they would be able to keep the England winger at the club if there is interest from so-called bigger teams.
"Tottenham is a big boy," Redknapp said.
"Man United have (Antonio) Valencia who they got in the summer so they don't need a right-winger. This is a big club.
"He's still learning the game and getting better and better. He can still keep improving.
"He is a fantastic talent but knows himself he is not the finished article. There is still a long way to go but he's getting there."
Redknapp is in the market for a central midfielder in January and could also look at a back-up goalkeeper - but he has ruled out a move for Stipe Pletikosa from Spartak Moscow.
"He's way off, months away from being fit," he said.
"He won't be fit for January. Ben Alnwick has been in terrific form. Jimmy Walker is a terrific professional so we have back-up and Gomes has been in great form."