West Ham’s near-£100million summer spree on nine new faces have left Pellegrini with a first-team squad of 28 players and a major headache to pick his starting XI every week.
Pellegrini, who makes his league bow as Hammers boss at Liverpool on Sunday, said: “Maybe it is one of the most difficult things for a manager [to keep them all happy], because all of them want to play and with better players, more problem.
“But for me it is more difficult if you don’t have players. When you just have XI there would be no problem, same starting XI every week.
“I would have to choose the starting XI but also they know that if during the whole season if you don’t have a strong squad, it is difficult to be successful.
“But that is impossible for the amount of games, for the injuries players have. For me as a manager it is more easy to have more good players and some of them must wait, but to have that option to change.
“We have players in two different positions in each position and they must work in a competitive way between them.
“Then I make the decisions, options wise, on who plays.”
West Ham’s hopes are high heading into the new season following the appointment of Premier League winner Pellegrini and the backing he has received in the transfer market.
The club finished the transfer window as the fourth-highest spenders in the division. But Pellegrini claims the club’s transfer outlay has not heaped the pressure on him to bring success to the London Stadium.
He said: “I never knew a manager that didn’t have pressure, no matter how much he spends [on transfers].
“The pressure is the same in every game because the Premier League is a competitive league and pressure always exists. Every team spent money so the pressure doesn’t increase.”