West Bromwich Albion defender Jonas Olsson has admitted that the club will face a tough task replacing Romelu Lukaku when he returns to Chelsea at the end of the season.
The Belgian international has impressed while on loan at the Baggies this campaign, notching up 13 goals for Steve Clarke's side.
Olsson told reporters: "Romelu has been massive for us. It's not realistic to think we keep him.
"Someone who scores 13 goals for a club like West Brom, with all respect, it's a great achievement. He'll be difficult to replace but that's the challenge."
West Brom are currently eighth in the Premier League.