The Hammers fans cheered the team against Peterborough United in a pre-season friendly match at London Road on Saturday.
Samuelsen featured in the game, which ended in a 3-3 draw, and he was impressed with the enthusiasm the West Ham supporters showed during the match.
“Playing in front of the West Ham fans was amazing, I didn’t expect so many of them to come down today,” the 18-year-old told West Ham’s official website.
“I didn’t expect to get this opportunity this quickly, but I was really happy when he called out my name for the starting team and I hope to get more chances now.”
West Ham signed Samuelsenon a two-year deal earlier this summer.
The 18-year-old moved to West Ham from Premier League rivals Manchester City, where he was a member of their Elite Development Squad.
Samuelsen earned the contract at the Hammers after impressing coaches at the West Ham United Academy while on trial on the back end of last season.
The teenager has a bright future ahead of him, but it is unlikely that he will get to play regularly for the West Ham first team next season.
The Norwegian is best suited for the youth side for the time being, but he could get chances from time to time, especially in cup games.
The 2015-16 campaign may not prove to be a breakthrough season for Samuelsen, but it will be important for his development as a footballer.