Oliver Glasner has hailed Crystal Palace’s “very positive” January transfer business.

The Eagles signed teenage winger Romain Esse from Millwall for £14.5million including add-ons as well as agreeing a six-month loan for Chelsea left wing-back Ben Chilwell.

They were also looking to add a centre-back after a season-ending knee injury to Chadi Riad and Trevoh Chalobah’s return to Chelsea left them short in the position, but were unable to tie down a target.

“It was a very positive transfer window for us,” said Glasner, whose side visit Doncaster Rovers in the FA Cup fourth round on Monday night.

“We defined the targets, positions and profiles very early — far before the transfer window. We started working on it. Like always, you have two wishes. To sign them on January 1 and they start training with us on January 2 — but I’m really convinced we found the right players for us.

“With Romain, he’s a young, highly talented player. With Ben, he’s much more experienced and knows the Premier League.

“We loaned Jeffrey Schlupp to Celtic and we lost a very experienced Premier League player and a very important player in the changing room. Schluppy was highly respected by everyone in the dressing room and club because of his career and personality. I think we did a good job.”

Centre-back Chris Richards and forward Eddie Nketiah are doubts for the trip to Doncaster, who sit third in League Two.

“Chris Richards is sick,” Glasner revealed, “so he hasn’t trained until now. I hope that he will be back with us tomorrow [Saturday], but I don't know if he can train yet. So there is a question there.

“Unfortunately, Eddie Nketiah got injured in the training, twisting his ankle, so there is a big question mark over whether he will be available.”

Eberechi Eze will be rested and will not feature. Meanwhile, Adam Wharton and Ben Chilwell are available but may not both start.

Chilwell is awaiting his Palace debut, while Wharton made his first appearance since groin surgery in last weekend’s 2-0 win at Manchester United but is still awaiting a first start since regaining fitness.

Glasner explained: “Both are ready to start, but I don’t want to plan that both have to be subbed off at half time.

“I have to think more in detail about it, but when you ask me now, my feeling tells me that it is not a good idea to start both at the same time when both are not available for 90 minutes.”

Asked whether Esse, who scored a debut goal off the bench in the recent 2-1 defeat to Brentford, will make his first start, the manager replied: “It’s possible, yes. But there are many things to consider. It’s different during a [busy] week, maybe then you have to manage the minutes.”