The 22-year-old's ninth goal in United colours gave United a 27th-minute lead and Whites head coach Bielsa has provided an assessment of the forward's progress at Elland Road after passing the centurion milestone.
"I think he’s improving," said Bielsa, asked how impressed he had been with Roberts’ development.
"I think he can show a lot of his virtues.
"And at the same time, there’s a lot of things that he can do that he hasn’t made visible yet."
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Thank you Laura Collins