The Irish teenager made his Premier League debut on Sunday. West Ham defender Declan Rice, 19, is another youngster pushing for a senior global debut after making 13 league appearances for the Hammers this season.
"I'm just thankful to the club and all the staff that made it happen". The manager stopped me and said that I would be training instead and would maybe be in the first-team squad, It was confirmed later on in the afternoon.
"It's a special feeling. I've dreamed of it since I was a kid!"
"I can't stop here this is just the beginning of what I'd like to hope is my career, I'd like to move forward from here".
It was almost the flawless debut for Obafemi as he had a chance to bag the victor but the striker's shot from James Ward-Prowse's cross narrowly missed the target.
With Charlie Austin injured, Manolo Gabbiadini lacking conviction in front of goal, while Shane Long is now out with illness, Pellegrino saw fit to call upon Obafemi yesterday and the youngster nearly seized his opportunity.
Obafemi, perhaps a little too eager to impress, couldn't quite make contact with the ball and the opportunity passed him by, but the 17-year-old is a very exciting prospect who deserves further opportunities for Southampton.
"I think he's a really fast player", said Pellegrino in his post-match interview.
"He is also a good finisher, and I observed that their back four was really high and he could have some chances".
"He was there really close but it's the beginning of his career, still he has to grow a lot but to us, that we have had a good history with our home-grown players, Michael is one more".
Obafemi is part of Tom Mohan's under-19 side that breezed through the first stage of qualifying for the European Championships this year, topping a group containing Serbia, Cyprus and Azerbaijan.