"I saw my name on the starting XI and as soon as I saw that my heart just started beating quick," Alzate said after receiving his Premier League Debut Ball.
"But I was ready for it. The adrenaline just hits you and the buzz around the stadium was crazy. I got goosebumps and everything."
The 21-year-old rewarded the faith of head coach Graham Potter, who has started the winger in each of the last three matches, including a 3-0 win over Tottenham Hotspur inspired by the two goals from fellow homegrown debutant Aaron Connolly.
Alzate was on loan at Swindon Town in League Two last season, and after being handed his chance by Potter he sees his three Premier League appearances as just the beginning.
"It's everyone's dream to play in the Premier League," Alzate, who signed a new contract last month, added. "I'm grateful for the opportunity and I've got to kick on from here."
"He [Potter] has been good with all of us and the fact that he's given youngsters a chance, it's a massive thing."