Frank Lampard believes if Chelsea tie Antonio Conte down to a new contract it would be their signing of the summer.
Conte has signalled his eagerness to stay next season but an extension to his current deal, which expires in 2019, is yet to be confirmed.
The Italian is one of the most sought-after coaches in Europe after leading Chelsea to the Premier League title in his opening season at Stamford Bridge.
And while the Blues are set to make a number of big-money signings this summer, Lampard, who scored 211 goals in 649 appearances for the club, says Conte would be the best.