The Danish international has long been thought of as one of the Premier League’s best ‘ball-playing’ defenders, but has struggled to hold down a first-team berth under Brendan Rodgers this term.
The rejuvenated form of Martin Skrtel, Kolo Toure’s vast experience and Mamadou Sakho’s arrival have dramatically increased the Northern Irishman’s options at centre-back, pushing Agger – whose performances have been a little inconsistent – down the pecking order.
This has alerted Benitez, who is keen to set up a reunion with the man he took to Anfield in 2006.
Although the 29-year-old is happy to stay on Merseyside and battle for his future, the Spaniard is hopeful that the lure of battling for the Serie A title and a Europa League campaign – for which the defender will be eligible to feature in – could tempt him.
A loan deal may be used with a view to a permanent switch, although Napoli might face competition from Barcelona.
Benitez has already taken one Liverpool player on loan this season in the shape of goalkeeper Pepe Reina.