Leeds United full-back Stuart Dallas says he will "never have enough words" with which to thank Marcelo Bielsa for transforming his career.
Northern Ireland international Dallas was one of the key men in Bielsa's side as they won promotion to end Leeds' 16-year absence from the Premier League.
The 29-year-old has been converted by the Leeds boss from a winger into an attacking full-back.
"I just wish he had come here earlier than he did," said Dallas.
In an interview with BBC Radio 5 Live, he added: "That's no disrespect to the past managers because I have always loved working with whoever has been here, but in terms of my performances he has really improved me.
"I think I speak for 99% of the team when I say that."
