Chelsea boss Antonio Conte reportedly believed a deal was all but done to sign Virgil van Dijk before he went on holiday.
The Italian has seen no new additions made to his squad so far, despite making his targets clear.
Having guided Chelsea to the Premier League title in his first season in west London, a summer spree is expected.
Conte wants to bolster his side ahead of their return to Champions League football next season, but he has so far been left disappointed.
Reports have suggested the manager is on a collision course with the club and considering his future due to frustrations over Chelsea’s transfer strategy.
No new deal has been announced yet for Conte, and it appears more than one incident has annoyed him already this summer.
According to The Telegraph, a move for key defensive target Van Dijk was almost hijacked by Liverpool.
Conte apparently left for holiday thinking a deal to sign the Southampton man was virtually agreed, only to find the Reds had muscled in.
Liverpool’s pursuit has since collapsed but the Saints’ stance has now hardened and Van Dijk’s price-tag has risen.
The Telegraph add Conte was also disappointed Chelsea failed to make a bid for Dries Mertens.
The winger penned a new contract with Napoli in late May after a stunning season in Serie A, but Antonio Conte was keen to go in for the Belgium international beforehand.
Leonardo Bonucci is now the manager’s clear target in defence, but Chelsea would have to pay over £50m for the 30-year-old.
Should the club decide against a move, it will only intensify Conte’s frustration, with Everton’s Romelu Lukaku not secured yet either.