Symons was in attendance at the Macron Stadium, where Wednesday and Bolton played out a 0-0 draw, as he looked to get some first-hand knowledge of his side's opponents this weekend.
Fulham are set to travel to Hillsborough to take on Carlos Carvalhal's men, and he is expecting a very tough test, with the 44-year-old wary of Wednesday striker Atdhe Nuhiu.
“I went up to watch them against Bolton on Tuesday and I thought they played some really good football,” he said. “They passed it really, really nicely, they looked very bright, and they’ve got a real threat with people who can run in behind.
“They’ve obviously got big [Atdhe] Nuhiu up front who’s a physical presence and a real handful. I was quite impressed with them, I’ve got to say. They created a lot of chances and should have won the game against Bolton, so they’re a threat, they’re a good side.
“They look to play a different style of football [compared to last season], and they pass it really nicely this year I think. Their pitch is a lot better than it was last year which will enable them to play a good passing game of football. Hillsborough is one of the iconic stadiums and it’ll be a tough game."
Despite Symons' praise, Wednesday have struggled to turn some encouraging performances into wins so far this season.
The Owls have not triumphed in any of their last six league matches, and they occupy 18th spot in the Championship table.
Their lack of cutting edge has been a worry, and it has meant that some eye-catching displays have not earned them as many points as many observers would suggest that they deserve.
Fulham, meanwhile, have started to show their class - and they travel to Yorkshire in good form. Symons has guided his side to three victories in their last three games, and they will be keen to extend that run in Yorkshire on Saturday.