Chelsea had high-level officials posted at the Santiago Bernabeu to see Real Madrid defeat Atletico Madrid on Saturday.
AS says Chelsea had a delegation in the executive boxes to see Atletico striker Radamel Falcao in action.
The Colombian is a top target for Blues owner Roman Abramovich, though struggled to make an impact on the night.
Indeed, talk of a January move to Chelsea appears to have unsettled Falcao, who has only scored once in the last five games.