Sexton shadow hangs over Irish Six Nations title defence

Ireland's hopes of successfully defending their Six Nations title hinge on filling the "massive gap" left by Johnny Sexton's decision to retire after their Rugby World Cup quarter-final loss to New Zealand, former Irish fullback Hugo MacNeill told AFP.

Sexton's retirement left head coach Andy Farrell needing to name a new captain and find a flyhalf who MacNeill says can "take a game by the scruff of the neck".

"There is huge pressure due to the massive gap Johnny Sexton left," said MacNeill.

"I cannot think of another Ireland player who retired - with all due respect to Brian O'Driscoll and Paul O'Connell - who both directed and led the game leaving such huge gaps to fill."

The 37-times capped MacNeill - a member of the 1982 and 1985 Triple Crown-winning teams - believes Farrell got the first call right in appointing veteran Peter O'Mahony skipper.

The 34-year-old flanker is seen as a stopgap but with probably the toughest Test up first away to France on Friday, and the psychological scars healing from the heartbreaking 28-24 defeat to the All Blacks in the World Cup, MacNeill says O'Mahony is the perfect fit.

The 101-times capped O'Mahony has already captained Ireland 10 times while the younger James Ryan has been widely seen as the man being groomed for the role.

However, the lock's fitness and form were not at their best in the World Cup.

"Andy Farrell had to replace Sexton as fly-half which, with the best will in the world, none of the options are in the same league, and find an equally inspirational captain," said MacNeill.

"The Irish team is a really good side but a group of leaders has not emerged yet. Only Peter O'Mahony had shown that quality.

"He opted not to take a risk and named someone who is a proven leader and at