Bielsa wrote De Bock’s chances of breaking into Leeds’ team off soon after taking charge.
The full-back was sent out on loan last term to Oostende and he has joined Sunderland for the season this time around.
And De Bock has suggested that he struggled to fit in at Elland Road as soon as Bielsa took over.
“The manager (Thomas Christiansen) at Leeds got sacked after three weeks of me being there!” De Bock said, while reflecting on his time at Leeds.
“A new manager (Paul Heckingbottom) came in and at the end of the season he got sacked too. Another manager came (Marcelo Bielsa) and it was difficult then.
“The results were not good and my own game was not so good so they decided to buy another left-back. My first two games were really good but I picked up an injury and there was a negative feeling around everything.”
There were big hopes for De Bock at Leeds shortly after he arrived, but he quickly fell out of favour.
The Belgian never really looked up to scratch at Leeds, with his defensive performances concerning.
The 26-year-old now joins Sunderland with a point to prove, as he needs to show that he can play in English football.
Although it seems that De Bock will be able to force his way back into contention at Leeds, even with a strong loan spell, he could earn himself a move elsewhere if he can impress at Sunderland.
De Bock could make his debut for the Black Cats at the weekend, when they take on Accrington Stanley.
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