The north Londoners have seen their title hopes dashed after taking just two points from their last four league games which included a 1-1 draw at Watford last time out.
Pochettino confirmed Spurs are targeting English players as the club's 17-man Champions League foreign quota is already full and Erik Lamela is yet to be added to the squad for the knockout stages of the competition.
Spurs go into Saturday's Wembley clash against Stoke outside the top four following a run of four Premier League games without victory.
"Some hard periods happen for all the teams", the Argentine told reporters on Friday. "The dynamic can change in football, all is possible". To keep the same level during 10 months is so hard for a group of players. Not only us, we are struggling to follow them.
"We were talking about how important it is to identify our targets and 3 July, when we start pre-season, have them here". The Guardian ranked all 16 teams left standing and Spurs checked in at #9.
"Of course it hurts him when the people don't support him and they do with other players who aren't so good".
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Pochettino said the Belgian worldwide would be out for weeks rather than months, however, and refused to blame Alderweireld's absence for the slump in form.
"But it wasn't the case, he doesn't need anything more than to work hard and have treatment now from medical staff".
"He's on plan, on time and he's recovering well. We don't need to be anxious because we avoid, and he avoids, an injury that could [have] maybe kept him out for a long time".
Pochettino is set to recall a number of first team regulars with Hugo Lloris, Eric Dier, Jan Vertonghen, Mousa Dembele, Kieran Trippier, Christian Eriksen and Harry Kane all set to return.
'We tried to do that in the summer but we could not, for different reasons.
"Then we have [Juan] Foyth, Ben Davies can play like a centre-back, Serge Aurier can play like a centre back - he has played before there for Paris Saint-Germain".
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