Shane Horgan and Brian O'Driscoll in jovial mood during training

The only change to the 22-man match squad that destroyed England is the inclusion of Wasps scrum-half Eoin Reddan for the injured Isaac Boss.

Boss was forced out on Monday following a scan on his injured left shoulder.

"Naming the same team was one of my more easy selections," O'Sullivan told BBC Sport.

Reddan has one international appearance to his name, when he came on as a late replacement for Brian O'Driscoll during last season's high-scoring defeat by France in Paris.

The former Munster player moved to Wasps two seasons ago, and quickly forced his way into the starting line-up.

O'Sullivan now awaits a backlash from Scotland who were humiliated by Italy two weeks ago.

"They will come out firing on all cylinders," said O'Sullivan. "They will hit us hard right from the first whistle.

"Scotland have nothing to lose. They will be very much the underdogs going into the game, but we will certainly not be taking them lightly.

"The Ireland players quickly came down to earth after the win over England and they know they have to focus on what lies ahead."

Ireland: G Dempsey; S Horgan, B O'Driscoll, G D'Arcy, D Hickie; R O'Gara, P Stringer; M Horan, R Best, J Hayes, D O'Callaghan, P O'Connell, S Easterby, D Wallace, D Leamy.
Replacements: J Flannery, S Best, M O'Driscoll, N Best, E Reddan, P Wallace, A Trimble.