Fans have taken to Twitter to share their thoughts on the potential role he plays in the current season.
One said: “#LineOfDuty Cheif Constable Philip Osborne is the driver in all this. He is the link to the OCG I’m sure of it. He was dodgy from series 1.”
At the end of the last episode, fans were left wondering who Jo Davidson (Kelly MacDonald) was related to following a shocking revelation.
One fan suggested it could in fact be Osborne. They said: “Is Jo Davidson’s blood relative Philip Osborne?
“We saw him in archive footage this season, so we have already had a callback to his character. Surely that’s not for naught?” [Sic]