Robertson is wanted by Liverpool, Newcastle United, Burnley and West Ham United.
Newcastle have not made major moves in the transfer market but Carver is confident there is money to spend.
Manchester United, Newcastle and Spurs were all recently linked with the midfielder.
19-year-old midfielder is considered one of the jewels of the La Masia academy.
Casilla has been Madrid's second-choice goalkeeper ever since joining the club in 2015.
Everton are keen to strengthen their Under-23 squad as well as the senior team.
England Under-21 striker Abraham has been pursued by both Newcastle and Brighton so far this summer.
Will Mike Ashley deliver on his promise to back the Toon boss in the transfer window?
Agent Manuel Garcia Quillon says Reina could yet resume his career in England.
The tycoon has made a fortune with Sports Direct but controversies are never too far away.
Ashley understood to be holding talks with investors over potential sale.
England U21 international says he has to "dream big" amid rumours over latest season-long loan deal.
Freddie Woodman saves late penalty as Young Lions secure country's biggest international title since 1966.
England international is out of contract in 2018 and is eager to leave to boost World Cup hopes.
Arsenal and Tottenham had also been linked with the Eibar centre-back in recent days.
Newcastle manager Rafael Benitez is an admirer of Abraham and wants him at his club.
Ivorian midfielder, 30, had been playing for Beijing Enterprises Group FC in China's second tier.
The 19-year-old netted 26 goals while on loan at Bristol City in the 2016-17 campaign.
The England U21 international spent last season on loan with Bristol City.
Former loanee makes quick return to St James' Park after helping Magpies to claim Championship title.
Ex-Hammers forward believes the 34-year-old will attempt to return to East London this summer.
Owner Mike Ashley could give Spaniard access to upwards of £170m in the summer.