Lazio say Ciro Immobile and Sergej Milinkovic-Savic have extended their contracts with the club until 2023.
Immobile signed a new deal last season that ran until 2022. The 28-year-old Italy international finished joint-top goalscorer in Serie A last season, netting 29 times.
It was the second time Immobile has won the prize, having done so in 2014 after scoring 22 goals for Torino.
Immobile has been at Lazio since 2016 after unhappy spells at Borussia Dortmund and Sevilla. This season, he has featured in all seven Serie A matches, scoring four times. He's also netted in the Europa League.
The 23-year-old Milinkovic-Savic has missed just one of Lazio's matches and has one goal.
The Serbia midfielder is in his fourth season at Lazio and scored 12 league goals last campaign.
Lazio are seventh in Serie A after losing to Roma 3-1 in the capital derby on Saturday.