Ferreyra, signed on loan from Shakhtar Donetsk, is yet to make a competitive appearance for the club.
"Ferreyra has been a bit unfortunate since he arrived, and has had a couple of knocks that have knocked him back," said Pardew.
"He had a reserve game recently with (Ayoze) Perez, and they both did well.
"Perez is probably just in front of him at the moment.
"He needs a bit more football and a few more games, but he's another footballer who needs to adapt to the Premier League.
"It's a tough league. When you don't start well, it's more difficult for these guys to adjust.
"The only message I've seen on the training ground that they are trying their damned hardest to show that with a result."
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