Chelsea are stepping up their search for a striker after making enquiries for Barcelona's Pierre-Emerick Aubameyang and Red Bull Salzburg's Benjamin Sesko, sources have told ESPN.

The Blues are keen to add further reinforcements after allowing Romelu Lukaku to rejoin Inter Milan on a season-long loan and are assessing their options before making a formal move.

Those under consideration include Aubameyang, who only left North London rivals Arsenal in January to move to Camp Nou on a free transfer.

ESPN reported in April 2020 that Chelsea were monitoring Aubameyang before he signed a new long-term contract with the Gunners.

Thomas Tuchel has since replaced Frank Lampard as head coach but that interest has endured, with Tuchel enjoying a close relationship with Aubameyang from their time together at Borussia Dortmund.

It is unclear at this stage whether Barcelona would be willing to part with Aubameyang, although they have already signed attacking duo Robert Lewandowski and Raphinha this summer and are under pressure to raise funds in order to register their new players for the upcoming LaLiga season.

Aubameyang left Arsenal after falling out with head coach Mikel Arteta over what the club perceived as repeated acts of ill discipline and poor professionalism.