The Spurs youngster had a quiet first season in English football but his new manager is confident that the 22-year-old is capable of delivering on the promise he showed in Italy
The former Roma star failed to make an impression after his big-money move to White Hart Lane last summer but has impressed in pre-season and the new Spurs boss expects better things from his charge this term, though he still wants patience for the 22-year-old.
"[There is the] Erik Lamela you know and [the one] we know from Argentina and Italy," Pochettino told reporters, "but he is still young and the Premier League is the most difficult league to play in - in terms of the style, the language and to adapt.
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"Everyone expects a big performance from Erik Lamela," the ex-Southampton boss added, "[but] he needs time. I expect from all, not only from Lamela, to show their ability."
Tottenham have brought in Ben Davies and Michel Vorm from Swansea City, together with Eric Dier from Sporting, during the close-season but Pochettino would not be drawn on whether there were any more players on his radar.
"I won't talk about another player or our targets," he continued. "Ben Davies, Michel Vorm and Eric Dier add balance to the squad. The profile they have is good for us."
And, while acknowledging he has taken charge of one of the biggest teams in the Premier League, Pochettino stressed that it was "impossible" to promise success.
"I think the challenge for all managers is to win trophies but I'm focused on developing our style at Tottenham - that's the most important at the moment," the Argentine remarked. "It's important to work hard, to believe, to be realistic. We are ambitious but it's impossible to promise [trophies]. We need to show our ambition in every game."