Concise News learned that Boro confirmed on Friday morning that Pulis‘ contract would not be renewed, ending an 18-month reign on Teesside.
“Middlesbrough FC can confirm that the contract of manager Tony Pulis will not be extended,” a club statement read.
Pulis joined Middlesbrough on Boxing Day 2017, just days after Garry Monk was sacked.
He guided the Riverside club to a fifth-placed end last season, but they were defeated by Aston Villa in the play-off semi-finals.
The Welshman could not replicate the feat this term, with Boro finishing one point outside the top six with Derby beating them to the final playoff spot.