Toral is on-loan from Arsenal.
Warburton told GetWestLondon: "Toral came through the Barcelona academy. He's had a fantastic education.
"I'm delighted to have that relationship with Arsenal and delighted Jon is embracing it.
"He'll get better and better and I have no doubt Jon will play in the Premier League.
"I met with Arsene recently and he asked me if he's got the potential to play in the top flight. I've got no doubt he has."
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