Ahead of facing Wolves today, Glasner was asked about Wharton gatecrashing England's Euros squad.
He responded: "Adam does really well, otherwise he wouldn't play almost every minute.
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"He starts every game because he always shows great performances with his passing, with his solutions and with his hard work in central midfield together with Will Hughes - it's very important for us.
"Gareth Southgate was at Selhurst watching the game against Man Utd, so he doesn't need any advice from me. He will nominate the best players for England.
"Adam does really well and I and we all wish all the best to our players, so of course if he will be nominated (for England) it would be a fantastic achievement, but he's a young guy so he will have many international appearances, but it's Gareth Southgate's decision."