Chelsea have surged to the top of the Premier League in recent weeks, with Costa impressing greatly.
The Brazilian-born Spain international has rediscovered his sensational form of 2014/15, providing a clinical and calmer presence at the tip of Antonio Conte’s XI.
Costa has netted a Premier League-high 14 goals this season, with his latest coming in the 4-2 win over Stoke City on New Year’s Eve.
His brilliant set of performances under the Italian coach come just five months after a raft of transfer speculation, with Diego Simeone having confirmed he was interested in re-signing Costa for Atletico Madrid.
According to Marca, the Blues star’s suitors are now in a different continent, with Tianjin Quanjian eyeing an ambitious deal.
Fabio Cannavaro’s side made a bid of €60 million for Costa in December, the source suggests, which was rejected by Chelsea.
The report claims that Tianjin Quanjian will now increase their offer to €90 million, as they seek a replacement for Luis Fabiano, whose contract has now expired.
Diego Costa has displayed a 62% shot accuracy in the Premier League this term – up 9% on last season.