Leeds earned a narrow 2-1 win over Swansea at Elland Road on Wednesday night.
Matt Grimes has told Swansea City's official website that he feels he has improved a great deal since his failed Leeds United loan spell - but was impressed with his former side's display on Wednesday night.
Goals from Pontus Jansson and Jack Harrison gave Leeds a 2-0 lead at the break, and Marcelo Bielsa's side continued to control proceedings. However, Oli McBurnie scored a penalty in the final five minutes to make it 2-1.
Leeds held on, though the result could have been completely different had Grimes' free-kick hit the back of the net midway through the second half - his effort clipping the outside of Kiko Casilla's post.
The 23-year-old managed just 12 appearances for Leeds during a season-long loan spell in 2016-17 under Garry Monk, but he has been a regular in Swansea's side this season and he feels he has improved.
“They are a good side,” Grimes said. “The game plan we set out to deliver did not quite work for us but we were a lot better in the second half. On another day I think we could have taken a draw.
"I didn’t feel there was too much between us at points. I thought we limited them to very few chances but the goals sucker punched us. I feel I have improved as a player massively since my loan spell with them.
“I don’t feel my time at Leeds was a reflection of what I can do. I am the first to admit that it was a struggle for me, but I have moved on and grown from that."
Swansea signed Grimes in January 2015 from Football League minnows Exeter City for a fee of £1.75million (BBC Sport), but this is the first season he has broken into the side - making 34 of his 41 Swansea appearances this term.
Leeds returned to the top of the Championship table with the 2-1 victory, as Norwich City suffered a surprise defeat to Preston North End at Deepdale on Wednesday night.
Bielsa's men are not in action this weekend, which may see Norwich go back to the top as they take on Bolton Wanderers away from home on Saturday. Leeds themselves take on Bolton a week on Saturday at Elland Road.