Chelsea striker Diego Costa has been left out of Vicente Del Bosque’s provisional Spain squad for this summer’s European Championships.

The Blues endured their worst ever campaign under Roman Abramovich’s rule last term as Jose Mourinho was sacked before Christmas.

Costa’s early-season form was a key factor in both Mourinho’s and the club’s remarkable slide from champions to chumps at Stamford Bridge.

He banged in 20 league goals in his debut Premier League campaign but mustered just 12 in 2015-16 as he was again hit with suspensions and controversy.

The 27-year-old missed Chelsea’s final two games with a hamstring injury but Blues team-mate Pedro did make the cut ahead of the big kick-off in France.

Here’s a closer look at how Costa has faded at the Bridge this season by comparing his 2014-15 campaign with the statistics the fiery striker accumulated last term.

Diego Costa's season stats for 2014/15

Instant impact: Chelsea's Costa celebrates with the Premier League trophy

The Chelsea star arrived to much fanfare having won La Liga with Atletico Madrid and dumped the Blues out of the Champions League as he reached the final.

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Diego Costa's season stats for 2015/16

Down and out: Costa was below par for much of last term

Having won the Premier League at the first time of asking and terrorising top-flight defenders, Costa has been unable to match the standards he set in his debut campaign.

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Full Spain squad

Goalkeepers: Iker Casillas (Porto), David De Gea (Man United), Sergio Rico (Sevilla).

Defenders : Sergio Ramos, Dani Carvajal (both Real Madrid), Gerard Piqué, Jordi Alba, Marc Bartra (all Barcelona), Cesar Azpilicueta (Chelsea), Mikel San José (Athletic Club), Juanfran (Atletico).

Midfielders : Bruno (Villarreal), Sergio Busquets, Andres Iniesta (both Barcelona), Thiago (Bayern), Isco (Real Madrid), David Silva (Manchester City), Pedro, Cesc Fabregas (both Chelsea), Saúl, Koke (both Atletico).

Forwards : Aritz Aduriz (Athletic), Nolito (Celta Vigo), Alvaro Morata (Juventus), Lucas Vázquez (Madrid).

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