The France winger and Poland midfielder have played bit-part roles at PSG in 2016-2017 despite it being their first seasons at the club.
Ben Arfa has made 32 appearances in all competitions, the majority off the bench, 13 more than Krychowiak, who was a key player under Unai Emery at Sevilla last term.
Both have been linked with a move at season's end and Emery has done little to quell the speculation ahead of Sunday morning's AEST game with Caen with Ben Arfa left out and Krychowiak sent to play for the reserves.
He told reporters: "Ben Arfa is not in the squad for technical reasons.
"[Thomas] Meunier, [Layvin] Kurzawa, Thiago Silva and [Marco] Verratti are injured while Krychowiak will be in the CFA squad."
It has been an underwhelming season for PSG, who failed to win Le Championnat for the first time since 2012 and exited the UEFA Champions League at the round-of-16 stage after a dramatic collapse against Barcelona.
But Emery has defended their league record and highlighted Monaco's achievement in pipping them to the title.
"We must say congratulations to Monaco firstly, because they deserve it," he said.
"Normally, with our points total we would be champions but another team has been better.
"If we win tomorrow we will get to 89 points - the second biggest total in the history of the club.
"I am thinking positively. The club has showed confidence in me to continue working. Next year the first goal will be to win the championship."
Talk has already turned to which players the Qatar-backed club will target in the summer but Emery concedes it is not easy to attract the big names.
He added: "We do not need a lot of players, there is a strong spine of three, four or five ...
"Who is able to improve this team? You need important players, but it's not easy."
Saturday's game is likely to mark the end of Maxwell's career at PSG after more than five years with the Brazil fullback not offered a new deal for next season.
"Maxwell is a player who deserves a good ovation tomorrow from all of us," said Emery.