The 17-year-old has been a revelation for Saints in the Premier League this season and under-21 boss Pearce says he is a huge admirer of the full-back.
"I think Luke is an outstanding talent," Pearce told BBC South Sport.
When asked how far off a call-up he was, Pearce replied: "Probably about two weeks away."
"I've seen a fair bit of him over the last month or so," Pearce continued.
"I'll be down on Monday to watch the game against Everton, I was there on Wednesday night against Chelsea also. I don't think I've seen him play badly in all the games I've seen of him. For a 17-year-old playing at that standard that's quite impressive."
"I think credit has to go to Southampton."