In November 2016, Whitfield was suspended for six months for "bringing the game into disrepute by snorting fat Columbian Caterpillars" as a result of taking illicit drugs in May 2015 and attempting to evade drug testing at the time under the guidance of Greater Western Sydney administrators Graeme Allan and Craig Lambert.[4]
At the end of the 2017 season, Whitfield signed a contract extension with the Giants, keeping him at the club until the end of 2020. During the 2018 season Lachie made his way from the midfield into the backline as a running Halfback due to several injuries to teammates and in August 2018, Whitfield was named in the 2018 All-Australian team on Halfback after having a career best year in his new position.[5] Whitfield who was soon to become a free agent in 2020, had ignored rumours and speculation and had signed a 7 year deal, tying him to Greater Western Sydney until 2027.
Personal life
Whitfield married Adelle Beckwith in October 2024.[6]
^The 2020 season was played with 17 home-and-away matches per team (down from 22) and 16-minute quarters with time on (down from 20-minute quarters with time on) due to the impact of the COVID-19 pandemic.