UEFA granted the Greek giants special dispensation for the pitch at the Karaiskakis Stadium, which has been described as "dry" and "patchy".
Dyche said: "It's not great, but we knew that before we came. We were made aware that we'd have to train on an alternative surface which they provided, which is equally not that great I'd say, but useable.
"But it [Wednesday's session] was only to get the travel out of their legs. We'll have a light session in the morning, but obviously not here. This is certainly a pitch that will be interesting to see how it plays.
"It's not ideal, but to be fair I'm sure this club don't want it like that. We're not too worried about it. It's a challenge, but this whole competition will be a challenge."