It's no secret that Costa tried to force through a move to former club Atletico Madrid last summer as a result of what the 28-year-old perceived as unfair treatment from referees.
Costa and Chelsea have yet to comment on the latest rumours, but it now appears clear that the player and his suitors in China are keen to push forward with a deal that could see the forward earn €650,000-a-week.
Back in January, Diego Costa and boss Antonio Conte had a big bust-up at Chelsea's training ground that looked like it might wreck the Blues march towards the Premier League title.
"I can only say that we are still working on the deal [to sign Diego Costa]. We expect the best", he told sina.com when asked about the club renewing their interest in the Chelsea star.
He has scored 17 Premier League goals this season, but only three this year.
And Yuhui suggested that his club will continue to try and tempt top players to join his club, saying: "We have high standards [in buying foreign players] and those players prefer top clubs such as Bayern Munich and Real Madrid". It's safe to say we have the same transfer targets as those illustrious clubs.
"We may have to pay bigger prices because our club is now competing with Real Madrid and Bayern Munich".
Tianjin, under coach Italian Fabio Cannavaro and with the likes of Brazilian Alexandre Pato and Belgian Axel Witsel in their ranks, have made modest start to the new season with two wins and two draws from their first five games leaving them seventh ahead of Friday's meeting with Beijing Guoan.