On-loan centre-forward Romelu Lukaku is set to return to Chelsea.
Defender Olsson said: ‚ÄúRomelu has been massive for us. It‚Äôs not realistic to think we keep him.
‚ÄúSomeone who scores 13 goals for a club like West Brom, with all respect, it‚Äôs a great achievement.
‚ÄúHe‚Äôll be difficult to replace but that‚Äôs the challenge.‚ÄĚ