Out since seeing a January move to AC Milan collapse due to a knee complaint, Mateta was a late substitute for last week's draw with Europa Conference League opponents AEK Larnaca.
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Glasner, before today's clash with Leeds, said: "It’s good he’s back.
"He was injured in November during the international break and went on to play almost every Crystal Palace match despite a sore knee.
"He has always given 100% for this team, I have enormous respect for him."