The 18-year-old lost his father in early February, and had been given time off by the club to grieve.
He returned to the fold a few weeks ago, and he made a major contribution on Saturday, netting deep into injury time to ease the nerves that had crept in at St Mary’s.
Pochettino said: “We all know what Sam has been going through. He has been going through a really tough time.
“It [his goal] doesn’t change his situation, but it will go a long way to making him happy, and his surroundings, and his family – everyone around him that wishes the best for him. It will be a good thing for him.”