The 47-year-old has the mammoth task of replacing Crystal Palace’s most successful ever manager, Oliver Glasner.
Sage had a tremendous 2025-26 with French side Lens, running Luis Enrique’s great PSG side down to the wire for the Ligue 1 title.
His Premier League debut didn’t quote go as he would have hoped, however, falling to a 2-0 defeat to David Moyes’ Everton.
Speaking to BBC Match of the Day after the game, Sage admitted his side ‘gave up a little bit’ as the game went on.
"I think our first half should have put us ahead, but we didn't score and then made mistakes. We have to take positives and convert into very good things,” he said.
"Sometimes you deserve but don't score. What we have to keep from the first half is how we play, but we did make easy mistakes.
"We play with the ball and can lose it under pressure, but today we lost it when not under pressure. That's something we have to cancel.
"In the second half we were with less energy. I made the substitutions because I thought we could play more dynamic, but it didn't happen. We gave up a little bit. We have to understand when it's 2-0 the game is not over."
On Chadi Riad injury: "At the moment I don't know, I hope it will be better than we think. We await the medical tests."