Chelsea are chasing Porto stars Hulk and Alvaro Pereira.
Both players have been on Chelsea's radar since former Porto coach Andre Villas-Boas' arrival - and his dismissal hasn't changed their thinking.
Centre-forward Hulk has already attracted one approach from Chelsea this season, which saw Porto quote them a price of ââ¬100 million.
However, this summer, Porto are expected to price the Brazilian more realistically at around ââ¬40 million.
Similarly, fullback Alvaro Pereira was all set to join Chelsea in August for ââ¬26 million before Porto upped his price to ââ¬30 million at the final stage of negotiations.
Despite their anger at the time, Chelsea are confident they can now sign the Uruguay international for ââ¬20 million.