The Mullaghbawn man, full back on the Orchard county's 2002 All-Ireland winning side, received the support of officials and delegates at a scheduled meeting of the county board.
The ratification was dealt with swiftly and though no duration for the role was announced, many present expressed hope that McNulty be given time to develop the squad which has fallen down the pecking order in Leinster football in recent seasons.
McNulty has management experience with Cavan side Mullahoran and was a member of the Armagh backroom team under Paddy O'Rourke this season along with Donal Murtagh and Mike McGurn.
Meanwhile Kevin Walsh was last night ratified to remain in charge of the Sligo footballers for a further two years at a meeting of the Sligo county board.
There had been strong speculation over Walsh’s future since Sligo’s qualifier exit against Down but he will now continue in the position until the end of 2012 and will again be assisted by selectors Dessie Sloyan and Paul Taylor.
His decision will come as a huge blow to Galway who had been expected to target the double All-Ireland winner following the Armagh man’s surprise departure earlier this month.
The former All Star said he was honoured to be associated with the Galway post but insisted he was not leaving Sligo.
Walsh said: “It’s a work in progress with Sligo at the moment. We have made a lot of progress in the past two years but we have more to do and my commitment is with this group of players.
“It’s a big honour to be associated with the job in Galway but all of us in Sligo have made a huge effort and we need to give that every chance of moving on to the next level,” said Walsh who won All-Ireland senior medals with Galway in 1998 and 2001.
Walsh said it would be an honour to manage his native Galway at some point and said that he was anxious to clear up reports that there was some animosity with the county football board.
“I was nominated by some club for the Galway minor job a couple of years ago.
“ I did not pursue it, Galway football board knew that and I did not go for an interview.
“But then last year it emerged in some media reports that I had been ‘overlooked’ for the job, that there was some hassle over it, but that couldn’t be further from the truth.”