West Ham United are still waiting for a number of their players to return from international duty.
Commenting to the club’s official site, Bilic expressed his frustration that some members of his squad were still travelling back from representing their countries, even though the Hammers have a game on Saturday.
Bilic was boosted by the news that James Tomkins could return to action at the weekend against Crystal Palace, however.
The Croatian boss said: “Some players went to play international games, and now we are mostly back together, but not everyone. That’s why this Crystal Palace game might be coming a little too soon. I’m not happy because we will not have all of us on the pitch for training still.
“James Tomkins is back, and the only players who are out are James Collins and Sam Byram. They are progressing really well, but they won’t be in the frame for the Palace game.
"Some players are still flying back tomorrow, like Victor Moses, but Payet is back from France. It’s not ideal, but we want to immediately get back into the shape that we were in before the break.”
Tomkins has not featured for West Ham since the start of February, and his return would be a major boost for the London side.
Although West Ham have coped well in the 27-year-old’s absence, his return would significantly increase Bilic’s defensive options at Upton Park.
West Ham will need to utilise their squad over the remainder of the season, as they aim to be successful in two competitions.
The Hammers are attempting to break into the top four, and they also have an FA Cup quarter final against Manchester United to look forward to.
If the Hammers do beat Palace at the weekend, they could move about Manchester City and climb into the Champions League qualification spaces.