Lucinda Creighton says the Reform Alliance has the potential to expand and has been approached by Independent TDs.
The group of Fine Gael rebels says about 1,300 people attended its conference in Dublin on Saturday.
They previously said they may become a political party in the future but have no plans for it at the moment.
The group's most prominent TD Lucinda Creighton says the Reform Alliance is not recruiting, but has room to grow in the future.
She said: "We haven't tried to recruit anybody and we have been approached by other independents.
"We have discussed issues with them and we've co-operated and co-sponsored amendments and motions and so on.
"We are co-operating with other independents, but our group is what it is at the moment and there may be plans to expand in the future, but this exercise will feed into all of that."