The result means Palace are now unbeaten in the past 12 games.
Wharton told Premier League Productions: “It was a tough game. Obviously we're know they’re a tough team to beat, we've seen that in the last season.
“I thought the first-half of it we were playing pretty well, playing out well, creating a few chances. But then, I think the second-half we dropped off, we didn't play as much, they had more of the ball. It's just a point at the end of the day, but we’ll take it.
“I think there were a few tired legs, obviously third game in a week. But yeah, we know where we could have played, we did it in the first-half, so yeah, it's a disappointment from our side. I think we showed the work rate, staying in the game, and we had a couple of chances – but we’ve plenty to look at.”
Ismaila Sarr struck for Palace and Wharton added: “It always helps when you've got a player who’s in form.
“He's getting in the right positions, scoring goals, creating goals, and his work rate is unbelievable on the ball and off the ball.
“It’s great to play with him and he's getting in good positions, and if he can keep scoring, we'll be delighted.”