[citation needed] On 23 August, 2015, he made a try scoring début for Hull Kingston Rovers against the Widnes Vikings in an 8–12 victory in The Qualifiers.

It was revealed on 2 March 2016, that Lawler had signed a four-year contract at Hull Kingston Rovers following an impressive start to his professional playing career.

[citation needed] Lawler suffered relegation from the Super League with Hull Kingston Rovers in the 2016 season, due to losing the Million Pound Game at the hands of the Salford Red Devils in golden point extra time.

12-months later, however, Lawler was part of a Hull Kingston Rovers side that won promotion back to the Super League, at the first time of asking following relegation the season prior.

It was announced on 4 May 2018, that Lawler had penned a new three-year contract extension, to remain at Hull Kingston Rovers until at least the end of the 2021 season.