According to the Shields Gazette, Dick Advocaat had reservations about Sunderland signing Fabio Borini and DeAndre Yedlin during the summer transfer window.
Advocaat quit Sunderland over the weekend, and one of the reasons he walked away was reportedly because of his frustrations with the club's lack of activity in the transfer market.
The Black Cats waited a long time to secure their targets over the summer, and when new players did arrive they were not what the Dutchman wanted.
Advocaat had suggested that Sunderland needed a powerful target man to play up-front, but they snapped up Borini, an agile front-man, instead.
And, on top of this frustration, Advocaat had barely seen Yedlin play when the club sanctioned a deal to sign him on loan from Tottenham Hotspur.
It left the 68-year-old aggravated, and meant that he had to deal with many of the same problems that had lingered from last season.
Sunderland failed to bring in enough defensive or attacking quality when they had the chance, and they are now paying the price for their oversight, having collected just three points from their opening eight Premier League matches.