The Portuguese head coach was appointed by Nottingham Forest on an 18-month deal in February, becoming the club's third appointment of the 2025/26 season.
He succeeded a month-long stint in interim charge from Ange Postecoglou and a four-month tenure under Sean Dyche.
Pereira ultimately managed to steer Forest clear of relegation, though a 16th-place finish was evidently not enough to earn him another season at the City Ground.
News of his departure broke on Wednesday afternoon, though it is understood Pereira was actually informed of the decision on Monday evening.
According to GiveMeSport, the 57-year-old received no phone call to inform him of Forest's decision.
Instead, an email landed in his inbox at 11.58pm on Tuesday, June 30, informing him that the club had decided to move forward without him.
The report adds that Pereira held a clause in his contract allowing the termination to be activated before midnight. That timing meant the decision was confirmed with barely two minutes to spare before the clause would have expired.
No official statement had been issued by Forest at the time of writing.
The reliance on an email to confirm such a significant decision, rather than a direct phone call, is likely to raise questions about how the process was handled behind the scenes at the City Ground.
Pereira's dismissal comes despite him steering the club away from relegation trouble, a task that would ordinarily be expected to buy a head coach further time to build on his work.
Instead, the tight timing around the contractual clause suggests the decision to move on from Pereira had already been made well in advance of the announcement finally becoming public.
With no official statement yet issued, further details of the circumstances behind his exit are likely to emerge in the coming days as Forest turn their attention to appointing a successor.