#1 Current form

The Blaugrana are yet to lose a game this season whereas the Blues have lost 6 games in Premier League and once in Champions League so far. Barcelona go into the round of 16 fixture in a much better form than the Premier League giants.
Chelsea is struggling for consistency in recent weeks. They faced some heavy defeats at home and away to low lying Premier League opponents. They were beaten 3-0 by Bournemouth at the Stamford Bridge couple of weeks back and Watford thrashed them 4-1 at the Vicarage Road last week.
Though Barcelona is not playing their usual brand of attacking football like they did under Pep Guardiola and Luis Enrique, they are getting good results under Ernesto Valverde with a defensive approach. They are sitting pretty at the top of La Liga table with a seven-point lead over second-placed Atletico Madrid.