The midfielder was dropped from the latest England squad after an indifferent start to the season.
"I have had some conversations with Dele over the last two or three years," Pochettino said. "It's a process.
"He's young, 23, but I love the way he's working hard to be the best, to find the best form. That is a process that needs time, too.
"I think he's very close and he is doing well.
"It was a good opportunity for him in these last two weeks to work hard and clear things up in his head. And for us to help him find his best form."