Defending champions Liverpool will need at least a point in their final group game at Red Bull Salzburg to guarantee reaching the last 16 of the Champions League after a lacklustre draw against Napoli. The Reds would have gone through as Group E winners with a win but fell behind midway through the first half when Dries Mertens beat the offside trap to finish from a tight angle. Liverpool were far from their best in the first half as they struggled to put together the fast-flowing attacking football they are capable of, although went close to equalising on the stroke of half-time when James Milner was denied at the near post. Kalidou Koulibaly cleared Roberto Firmino''s effort off the line as Liverpool improved after the restart, with Napoli sitting deeper to protect their lead. The hosts finally equalised when Dejan Lovren headed home from a corner after 65 minutes, the goal prompting Anfield to roar into life as Liverpool fans urged their side on to find a winner. But despite a late push the Napoli defence held firm to earn a point. It means Liverpool will have to go to Red Bull Salzburg on 10 December needing a draw or hope Napoli lose at home to Genk. Off-colour Reds left with work to do With 11 wins and two draws in their previous 13 games, it had seemed before kick-off that this would be a straightforward night for the Reds. They hadn''t lost at home since a League Cup defeat by Chelsea in September 2018, while Napoli arrived at Anfield a side in disarray, with off-pitch unrest coupled with a run of six games without victory. But the Italians have been a thorn in Liverpool''s side in recent years. They had won two of their three previous Champions League meetings, and were only an Alisson save away from ending the Reds'' title-winning campaign at the group stage last season. A bright first five minutes proved to be a false dawn as Liverpool struggled to get a foothold in midfield, while their normally deadly front three of Mohamed Salah, Firmino and Sadio Mane could not link up effectively to carve open a disciplined Napoli defence. Liverpool have finished strongly in recent weeks to get wins against Tottenham, Aston Villa and Crystal Palace but even after Lovren''s equaliser there was never really a sense that they would go on and finish the job. It was an off day for Liverpool but the draw does keep their unbeaten run going and the performance will provide manager Jurgen Klopp with an indication of what needs improving ahead of a busy December. Injuries and experiments add to disappointment Liverpool are at the start of what could be the biggest challenge of their season, this game the first of 12 in just 36 days, and that perhaps prompted Klopp to assess his options to combat fatigue. He opted to play Joe Gomez at right-back with Trent Alexander-Arnold left on the bench, but it was an experiment that failed to come off as Gomez struggled to provide the same kind of attacking threat down the right as his England team-mate. But as well as a need to rotate, injuries will also be a concern for Klopp during this hectic run of fixtures. Salah started against Napoli after recovering from an ankle problem but struggled to make an impact in the game, while Fabinho limped off early on and an extended absence for the midfielder would be a blow to Liverpool''s ambitions at home and abroad. Man of the match - Dejan Lovren Another Reds recovery - the facts &#9726:When falling behind at Anfield, Liverpool are unbeaten in their previous eight games in all competitions (W5 D3). &#9726:Liverpool are unbeaten in their last 16 Champions League games at Anfield (W11 D5), last suffering defeat in October 2014 against Real Madrid. &#9726:Dejan Lovren has scored eight goals for Liverpool, with the Reds never losing when the Croatian centre-back has scored (W7 D1). &#9726:Liverpool''s James Milner has 11 assists in the Champions League since the start of the 2017-18 campaign - no player has provided more. &#9726:In European competition, Napoli have failed to win their last 10 away matches in England (D2 L8), facing six different English teams in that time - Arsenal, Burnley, Chelsea, Leeds United, Liverpool and Manchester City. What next? Liverpool are back in action on Saturday when they host Brighton in the Premier League (15:00 GMT).