The former West Ham man anticipates an exciting summer transfer window.
The Hammers are 90 minutes away from an FA Cup semi-final and sit well placed for a Champions League qualification bid, with Bilic's boys fifth in the table, one point behind fourth-placed Manchester City with nine games left.
It has been a quite brilliant season, but so much of that is down to the players which the Croat - who replaced manager Sam Allardyce last summer - brought to East London.
Sinclair, who spent five years at Upton Park until 2003, feels that the Irons' recruitment is second to none in the Premier League and hopes to see more stellar business done this summer.
"Slaven Bilic will probably be able to recruit even further in the summer so there are going to be new faces and arrivals and his scouting system is doing wonders," he told their official website.
"I think that sets West Ham apart from others in the Premier League and he’s already proved himself with his recruits last summer."
Payet, in particular, has looked impressive, and his 30-yard free kick looked like taking West Ham into the FA Cup semi-finals on Sunday, but Manchester United's Anthony Martial equalised to force a replay.