Lees came through the ranks at Leeds, but was ushered out the back door to Sheffield Wednesday in 2014.
Since then, the 26-year-old has established himself as one of the Championship's most consistent defenders and helped the Owls reach last season's play-off final, where they were narrowly beaten by Hull City.
Carlos Carvalhal's side are once again fighting for promotion this season, but have themselves a new top-six rival in Leeds.
Only a point and two places separate the two teams at present, with Wednesday climbing back into sixth on Saturday, and Lees, who claims to have kept in contact with 'a few old friends' at Elland Road, said of the Whites' progress: "I’m not surprised.
"Obviously, I think bringing in Garry Monk was a really big thing for them, he’s been given time to do what he does.
"When I speak to a few old friends there, it seems really professional, training seems really good, it seems to be run really well, and I think that’s all it needed really."
And their assessment may bode well for Leeds if so, with the Whites desperate to secure new deals for Mowatt and Taylor, who become free agents in July.
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