Chelsea have set the longest unbeaten record in the Europa League with their 1-1 semi-final first leg draw at Frankfurt on Thursday night.
Chelsea matched Atletico Madrid's 15 matches unbeaten run with their win over Slavia Prague in the quarterfinals, but have now gone above the Madrid side with their 16th match.
The Blues' last loss in the tournament came at the hands of Russian side Rubin Kazan back in the 2013 season - a 3-2 away defeat - but eventually went on to win the title.
With key player Eden Hazard named on the bench for the match in Germany, Chelsea struggled at times to have the usual rhythm, as the home side took control of the match.
Serbian Luka Jovic put the hosts ahead after 23 minutes, but Chelsea responded on the stroke of halftime as winger Pedro Rodrguez tucked in an equaliser.
The Blues will take a vital away back to Stamford Bridge for the return leg, and have the chance to extend their unbeaten run in London.