West Ham United are not set to be active in the January transfer window.
The temptation for Bilic could be to look to strengthen his squad even further to try to ensure that his side maintain their lofty position, but Curbishley feels that bringing in new faces could harm the balance of his squad.
"The recruitment that Slaven Bilic did in the summer stands them in good stead," Curbishley said. "They've suffered injuries to Winston Reid, Payet, etc and have managed to still have a fantastic first-half of the season.
"You are in danger of rocking the boat sometimes by bringing players in. I think they've overcome their injury problems, and they're looking forward now. I don't think they need to bring anybody in."
West Ham aren’t expected to be too active in January, and Bilic did say yesterday to TalkSPORT that only an exceptional deal would cause him to act.
Bilic claims that he is already happy with his squad and he feels that West Ham have enough cover.
“We have a good squad, a big squad, and [it’s] 99 per cent [certain] we will leave it like this and make our signings in the summer,” he said.
“If something exceptional comes along, whether that’s a long-term deal for one great player, or a loan deal for a back-up player for six months, we will do it. But we won’t buy just because it’s the transfer window.”
West Ham have already had to prove the depth of their squad this season, after suffering with an injury crisis.
Bilic’s men have had to deal with injuries to a number of key stars, but they have coped admirably, and are currently on a seven game unbeaten run.