Liverpool midfielder Allen desperate to rediscover best form
Allen admits he has not performed well of late but is keen to make amends in the last-32 first-leg tie in Russia.
"My form hasn't been great, especially compared to the start of the season, but that is more down to myself," said Allen. "But I am looking forward to working hard and try to turn things around a little bit.
"I haven't played that much recently so any chance I get to participate then I'll be hoping to impress as much as I can and stake my claim.
"We were bitterly disappointed after Monday's defeat to West Brom, that goes without saying, but we have this tie to look forward to and refocus."