Mateta, 28, is Palace’s prime scorer this season with eight Premier League objectives however instructed the membership he wished to depart earlier in January.
“Once more, there’s a lot noise, a lot hypothesis, so many issues happening,” added Glasner.
“We’d like each single participant at their greatest and JP [Mateta] is not at his greatest proper now with all of the noise that occurs.
“It may be soccer noise, but when somebody has non-public points the place they cannot deal with soccer, then it is not sensible to play.
“He can not help the workforce and carry out at his prime degree. We determined it’s higher to not play him.”
Palace sit fifteenth within the Premier League and have already offered captain Marc Guehi to Manchester Metropolis in the course of the winter window.
They’re but to discover a substitute for the England worldwide however Glasner, who stated earlier this month that he will probably be leaving on the finish of the season, is assured the membership are working to bolster the squad earlier than Monday’s deadline.
Palace have boosted their ahead choices by signing Evann Guessand from Aston Villa on mortgage with an choice to make the transfer everlasting.
“The membership is working nearly 24 hours a day proper now,” Glasner stated.
“Marc [Guehi] left two weeks in the past and no one is in. You may think about it isn’t really easy – each workforce needs to play a profitable season, so it isn’t really easy you can get the gamers on the finish of January.
“I see the membership working exhausting to get gamers in to interchange Marc and, after all, we have now to arrange if one thing occurs with JP [Mateta].”
Glasner stated the membership is making ready for various eventualities and Wolves striker Jorgen Strand Larsen stays a goal.
“To be clear, it may be that Mateta stays, and he’s a Palace participant on 2 February, and it may be that Mateta has left the membership and a brand new striker is in,” stated Glasner.
“These are the 2 conditions we’re speaking about and discussing proper now.”
Palace had been additionally prepared to supply £50m for Norway striker Jorgen Strand Larsen, however that deal is now within the steadiness after the Eagles communicated their intention to stroll away.
Wolves boss Rob Edwards confirmed on Friday that 25-year-old Larsen is able to play towards Bournemouth on Saturday.
