After the Champions League Final loss, Inter are setting their sights on the summer transfer market.
Inter Sporting Director Piero Ausilio will be in London to meet with Chelsea to discuss extending Lukaku's loan among other items.
During the meeting, Ausilio will seek to understand if Chelsea are interested in Onana. The Blues are also negotiating for Brighton goalkeeper Robert Sanchez.
Inter are also pondering Yann Aurel Bisseck from Aarhus and the Under 21 German National Team, who has a buyout clause worth 7 million euros. The interlocutor is expected to arrive in Italy on Wednesday.
Hertha Berlin, Bologna and Torino are also interested in Lukebakio.