He has also been discussing the impact new boss Slaven Bilic has already had on the side.
The 19-year-old starred in midfield for the Hammers in their first qualifying round second leg clash in Andorra on Thursday, playing 85 minutes on a busy evening for him.
The contest marked his full senior debut, after coming on as a substitute in the first leg the week before, and the youngster says he is delighted to have made his bow, with there an opportunity for all of the club's academy graduates to kick on from this point.
“I’m delighted to have made my full debut,” he told whufc.com.
“I was delighted to play at Upton Park last week and now to make me full debut is great. I thought I did fairly well. It was a tough game. I think there’s more to come from myself and more to come to from the other younger lads.”
The Bilic effect
These Europa League ties are, of course, the early days of new boss Slaven Bilic’s reign, with the former Hammers defender having replaced Sam Allardyce in the Upton Park hot seat.
The Croatian decided to hand the reins over to assistant Terry Westley for the first leg clash, but he has naturally been working with the squad as he assesses his options ahead of the new Premier League season.
And Cullen has praised the impact the former Besiktas manager’s arrival has already had on the players.
“Slaven’s arrival has freshened things up,” he added.
“Everyone has tried to impress him, he’s got a great presence about him. I’ve enjoyed working with him so far and hopefully that continues.”