Those two players are now fit and available again and Cook admits the 29-year-old former Derby striker will probably not feature again for the Sky Bet League Two promotion hopefuls before his stay at the Proact Stadium ends next week.
"Chris Porter was brought in as a short-term fix to what we've already got," Cook told Press Association Sport.
"Armand and Marc Richards were out injured and Eoin Doyle was expecting a child. Now all three of them are available again, they obviously come into my thinking ahead of Chris.
"It's likely that Chris won't be involved at the weekend but then he has one more week with us and if anything was to happen then it presents an opportunity for him to play.
"If that doesn't happen, though, then it's going to make it difficult for us to give him game time."
Porter has made four appearances for Chesterfield, starting the Johnstone's Paint Trophy win at Mansfield and the league games against Fleetwood and Burton.
- Sports & Recreation
- Chris Porter
- Armand Gnanduillet
- Marc Richards