"The next step for us is to go to Chelsea and come back with three points", said the Donegal man.
Steven Gerrard's Rangers saw their 11-game unbeaten run in this year's Europa League come to a dramatic end as they threw away the lead three times in a 4-3 defeat at Spartak Moscow.
"You know what summed it up for me more than anything last Saturday that they need a centre-forward?"
Barkley is successfully rebuilding his reputation after a hard start to his career at Stamford Bridge, also earning a recall to Gareth Southgate's England squad following a two-year absence.
While the former Juventus striker netted seven times in seven games to make an electric start to his Blues career, the Spain global managed just three times in their last 24 appearances in all competitions.
After a second-half to last season to forget, Morata has started to find his goalscoring touch again. I think we didn't play very well, I didn't like the first half because we moved the ball only horizontally and slowly, so it was hard to be risky.
"I can say they played very well".
The two Premier League teams were joined by Eintracht Frankfurt, Lazio, Bayer Leverkusen, FC Zurich and Dinamo Zagreb in the last 32 with two games still to play before the draw for the next round in Nyon, Switzerland, December 17.
The victory means that the Stamford Bridge outfit remain at the summit of Group L with 12 points from four matches and are already through to the next phase of the championship.
Nevin added: "Both goals by the Spaniard had a real striker's instinct, especially with the first touch on both occasions".
"Yes, the game was won, but Ian Wright, Alan Shearer, Robbie Fowler, Michael Owen, Thierry Henry, Harry Kane and the like would have sealed their hat-trick instead of trying to chip the goalkeeper, got the ball signed by everyone and then gone home". "In February we will have for sure another target, but the first one is very important".