There is no doubting Diego Costa's ability as a goalscorer, but the Spaniard is never far away from controversy.During his three years at Chelsea the forward hit the back of the net 58 times, but he also had a nasty streak on the pitch.By the end of his career at Stamford Bridge, Costa had fallen out with then-manager Antonio Conte.He blasted the Italian's character to the press and eventually forced a move to his former club Atletico Madrid.Before moving back to the Spanish outfit in January, the striker was heavily linked with a move to the lucrative Chinese Super League.Those rumours have resurfaced, with Marca reporting that Costa is threatening to leave Atletico for the Far East unless he is offered the same salary as Antoine Griezmann.[brid autoplay="true" video="307232" player="12034" title="Rafa's Pub Facts Germany Hit New Low & Jadon Sancho Makes Us Feel Old"]Costa has been in negotiations with Atletico regarding a new deal for months but there is yet to be a breakthrough.On Twitter, Chelsea fans posted their thoughts on the situation, with some hitting out at the striker's behaviour, while others urged the Blues to re-sign him.