The talented Jordan Ibe also scored one, with Jack Dunn scoring twice, but given Sinclair's call-up to the first team earlier this season, of any of the players in last night's match, it would be he who is most likely to join the squad.
The reason he may have a chance is because Liverpool's already thin forward line has been dealt a temporary blow by Luis Suarez' one-game suspension.
The Reds face West Ham on Sunday in the 4pm kick-off. Their striking options are certainly limited, Fabio Borini remains injured, and Brendan Rodgers will be thanking his lucky stars Suarez will miss just the one game.
Liverpool's most likely options include handing a start to Samed Yesil, the young striker signed from Bayer Leverkusen in late August, or fellow teenage striker Adam Morgan who scored in the NextGen Series last week.
Both players will be determined to seize their chances if they get them, but it won't be easy against a resilient West Ham backline which has performed well this season.
Further options for Liverpool include playing Raheem Sterling as a striker, or involving Dani Pacheco in the forward line.
Yet the dearth of options and an impressive showing last night could see Sinclair called up, not to start but a bench spot isn't beyond the realms of possibility.
When Samed Yesil started at the Hawthorns in the League Cup, Sinclair then was elevated to the bench, and came on and made his debut for the final nine minutes of the game.
Sinclair is of course not a traditional striker, he can play wide on the right, and may find himself called upon in case of emergency at the weekend.
If he is, and does feature, he would just miss out on becoming the Premier League's record youngest ever player, currently held by Fulham's Matthew Briggs - 16 years and 65 days, set in 2007. Sinclair will be 16 years and 80 days on Sunday.
Should Sinclair take a place on the bench this weekend?
image: © kevinzim