His role as Sean in the first series of Kay Mellor's popular BBC drama The Syndicate brought him significant early exposure. This part in the ensemble cast of a lottery-winning syndicate introduced him to a wider audience.
2013
Whelan gained further recognition with his recurring role as Marty Fisher in the final two series of the long-running Channel 4 comedy-drama Shameless. This allowed him to portray a complex character over an extended period.
2019
He landed a starring role as Detective Max Winter in the BBC One and ZDF crime drama The Mallorca Files. This international co-production marked his first major lead role in a prime-time series, showcasing his abilities as a main protagonist.