Millwall midfielder Massimo Luongo says Middlesbrough are the best team in the Championship this season.
Boro are two points clear of Coventry at the top - having wiped out the Sky Blues' 10-point lead - following their 2-1 win at Sheffield United on Monday night.
"Honestly… patterns, running, detail, everything is top," Luongo told BBC's Football Daily 72+ podcast.
"It's so good to watch. I put it on the other night and it was nice to watch. OK, you're full of confidence, you're top of the league but everything is sticking, they're running hard.
"You've got people overlapping, under-lapping, full-backs coming into the middle of the pitch. They are the best team I've seen this season."
Luongo described Boro's trip to Coventry on Monday as a "heavyweight" clash between the Championship's top two.
"Coventry rely on their goalscoring and they can, they can score goals," he added. "But I think Middlesbrough have a tougher chin."
Ex-Crystal Palace, Watford and Reading winger Jobi McAnuff also praised Boro boss Kim Hellberg for making his team "outstanding and really good to watch".
"Coventry have to be really careful because what has been the big problem for them of late is too much space in behind," he said.
You can follow live text coverage of Coventry v Middlesbrough on the BBC Sport website on Monday, 16 February (kick-off 20:00 GMT).