Atlético Madrid are under pressure to seal the signing of Diego Costa after failing to land another of their key summer targets.

The Spanish giants began the summer keen to sign Alexandre Lacazette, Sandro, Vitolo and Costa, with outline agreements in place for all four.

But Lacazette chose Arsenal over sitting on the Atleti sidelines until January, with the Court of Arbitration for Spot upholding their transfer ban.

How Chelsea could line up next season Show all 11 1 /11 How Chelsea could line up next season How Chelsea could line up next season GK: Thibaut Courtois Getty How Chelsea could line up next season CB: Antonio Rudiger Getty How Chelsea could line up next season CB: David Luiz Getty How Chelsea could line up next season CB: Gary Cahill Getty How Chelsea could line up next season RWB: Victor Moses Getty How Chelsea could line up next season LWB: Marcos Alonso Getty How Chelsea could line up next season CM: N'Golo Kante Getty How Chelsea could line up next season CM: Tiemoué Bakayoko Getty How Chelsea could line up next season RW: Pedro AFP/Getty Images How Chelsea could line up next season LW: Eden Hazard Getty How Chelsea could line up next season ST: Alvaro Morata Getty

And Sevilla midfielder Vitolo has now agreed a five-year extension to his contract - though is yet to sign it - after the Las Palmas president blabbed that Atletico were planning to have him loaned there until he could move to the Spanish capital in the winter window.

Everton offered Sandro wages of £120,000 per week to snub a move within La Liga and unveiled their £5.1m signing last week in another blow to Atleti's ambitions of strengthening their squad.

Diego Costa missed the first day of Chelsea's pre-season after staying in Brazil, though the Premier League champions had not expected him to report at their Cobham training base and do not intend to take him on their pre-season tour of Asia.

Instead they intend to sell him to Atletico, and are holding out for £30m. With Diego Simeone increasingly agitated by his side's inability to do business, the Blues expect Atletico to meet their asking price shortly.

Costa looks set to leave Stamford Bridge (Getty)

Atleti have also called on old friend Jorge Mendes to seal a deal for his client Fabinho. The Monaco utility man is seen as an alternative to the versatile Vitolo and was being courted by Paris Saint-Germain and Manchester United.

But while the Brazilian favoured a move to Old Trafford, the slow process of negotiations between Monaco and his suitors has seen Atletico gifted a chance to get their man and they bid close to £40m on Monday night - an amount close to what the Ligue 1 champions were asking for the wantaway midfielder.

Atletico sources point out that their key summer business has been securing the extended contracts of homegrown stars Antoine Griezmann and Saul Niguez, both of whom are wanted by Europe's elite.

Chelsea summer transfer targets Show all 8 1 /8 Chelsea summer transfer targets Chelsea summer transfer targets 1. Franck Kessie, Atalanta The first of many Serie A players on the list is Atalanta’s Franck Kessie, who scored six goals in 32 in the league from central midfield. The 20-year-old is subject of an offer from Roma, but it is thought that Conte sees the energetic Ivorian as a good option for the coming season and could intervene if the player decides to leave. A sum of just over £20m is expected to be enough to secure Kessie’s signature. Chelsea summer transfer targets 2. Radja Nainggolan, AS Roma Fiery midfielder Nainggolan was the target of a Chelsea bid last summer, and it is thought that Conte could prise him away from Italy this time around, as part of a double swoop with Antonio Rudiger at £70m. He is a player the former Juventus manager knows very well, and would fit perfectly into Chelsea’s side with his combative style. While Roma will be desperate to avoid letting two key players go in one hit, it may be difficult to turn down the right offer. Chelsea summer transfer targets 3. Alex Sandro, Juventus Sandro is emerging as one of Europe’s finest left backs and the Juventus man will be high on Conte’s list of targets. He is far more mobile than Marcos Alonso and would unlikely find it difficult adapting to Conte’s methods, which are largely similar to that of current Juventus boss Massimiliano Allegri. The player is also being tracked by Manchester City, and could cost upwards of £40m. Chelsea summer transfer targets 4. David Stockdale, Brighton Asmir Begovic is likely to leave Stamford Bridge in search of regular first-team football, and David Stockdale is an option for Chelsea. The 31 year-old keeper is out of contract this summer and helped his current club secure promotion to the Premier League this season. However, his error in the final game gifted Aston Villa an equaliser and Newcastle top spot in the Championship, and Stockdale later posted on twitter that he was ‘gutted to go out like that’ and thanked Brighton’s fans and staff, adding fuel to the fire over the exit rumours. Chelsea summer transfer targets 5. Ben Gibson, Middlesbrough Gibson’s stellar performances have been widely recognised over the course of this season and the 24-year-old centre back has worked his way into the England set-up. He is in a similar mould to the departing Terry and Conte is supposedly a big admirer of the £30m rated Middlesbrough man. Chelsea summer transfer targets 6. Andrea Belotti, Torino Another forward linked to Chelsea is Andrea Belotti, who at 23 has his best years ahead of him. The €100m release clause, applicable only to clubs outside of Italy, which was negotiated into his contract by club president Urbano Cairo, makes a move seem increasingly unlikely; nonetheless, the Italian is at the very least on Chelsea’s radar this summer. Chelsea summer transfer targets 7. Alexis Sanchez, Arsenal Arsenal forward Alexis Sanchez is thought to be seeking a move away from the Emirates this season after the Gunners’ disappointing campaign. He has stalled over signing a new contract, and with his current deal expiring next summer, Chelsea’s London rivals are at serious risk of losing their star man. While Wenger has insisted Arsenal no longer have to sell their best players, it could become a difficult situation if Sanchez wishes to stay in the capital and tries to force a move to Chelsea. Considering his contract situation, £55m could be enough to acquire the Chilean, with Bayern Munich apparently ready to offer exactly that at the start of the window. Chelsea summer transfer targets 7. Fernando Llorente, Swansea Antonio Conte has worked with Llorente in the past at Juventus and is keen on bringing him to Stamford Bridge, though faces competition from Spurs. Getty