According to Daily Mail, Chelsea director Michael Emenalo was in Spain to watch Anthony Martial in action as Valencia beat Monaco on Wednesday.
Chelsea have already completed the signing of Pedro from Barcelona and are now keen to sign a striker and a centre back before the window closes.
Emenalo was present at the Mestalla on Wednesday to run the rule over 19 year old Anthony Martial. The Blues have already made a £39m bid for the Frenchman.
The Monaco forward has been linked with a move away all summer and was subject to bid from Tottenham earlier.