The Blues are closing in on a deal for Leicester City defender Wesley Fofana worth 70m pounds, with the Frenchman understood to have undergone a medical on Monday.
Chelsea are also looking to secure a deal for young Everton midfielder Anthony Gordon.
But Aubameyang looms as a priority to bolster their forward ranks, with the club losing both Timo Werner and Romelu Lukaku during the off-season.
Aubameyang has played only once this La Liga season for Barcelona, coming on for 10 minutes, with Robert Lewandowski preferred.
The Gabon international joined Barca from Arsenal in January and netted 11 goals in 17 league games.
Aubameyang had signed a contract until 2025, although there was an option to agree departure in June 2023 too.
That headlines a likely flurry of transfer activity with Manchester United set to announce the signing of Antony from Ajax Amsterdam.
Cristiano Ronaldo’s potential move away from Old Trafford continues to be worked on by his agent Pedro Mendes, with links to Napoli.
Napoli’s Fabian Ruiz is set to leave to join Paris Saint-Germain, while Tottenham are keen on Atletico Madrid’s Yannick Carrasco.
Liverpool have also been linked with Felipe Caicedo from Brighton & Hove Albion although the Seagulls have a high price tag for him.
Crystal Palace have reportedly had a 27m pound bid for Conor Gallagher declined by Chelsea too.
Barcelona’s Frenkie de Jong also appears to stay at Camp Nou despite off-season speculation linking him with a move away.