O'Neill 'knows nothing' of Keane link to United
O'Neill was asked his opinion on the speculation that had suggested Keane could become assistant to Louis Van Gaal at his former club
"I don't know anything about it, I really don't," he insisted.
He also declined to be drawn on his opinion on how the sacking of David Moyes was handled.
"I'm sorry, but I've come here today to open a park and I wouldn't have any comment to make," he said.
The Ireland boss was at Marlay Park in Rathfarnham, Dublin, where he opened an all-weather soccer pitch on behalf of Dun Laoghaire- Rathdown County Council.
The €956,000 full-sized pitch was funded by the council with grant aid of €300,000 from the Department of Transport, Sport and Tourism.
The pitch is used regularly by a number of clubs in south Co Dublin.
It is also suitable for training by rugby and GAA clubs in the area.
O'Neill was happy to let some of the young football stars of the future display their skills and said he hoped he was still the Republic of Ireland manager when they came knocking on his door.
"Some of you are only 10 now – so that's very unlikely," he joked with the young fans.
He said it was a privilege for him to be in Marlay Park to cut the ribbon along with Cathaoirleach of Dun Laoghaire-Rathdown County Council Carrie Smyth.