That’s according to former Premier League star David Connolly who reckons the England ace is struggling after a relentless 12 months.
Kane was an ever present for Spurs last term and was a standout performer for the Three Lions at the World Cup.
Connolly, who played 61 games for Southampton before Pochettino joined the club, says the Argentine chief needs to consider other options.
“I know that he had his ankle injury and I don’t know whether he’s still feeling the effects of that or if that’s still niggling away at him,” he told LoveSport radio.
“I think Pochettino has had to think of a Plan B because traditionally he would play a 4-2-3-1 and Harry Kane was his No 9.
“This season with Lucas Moura up there, he’s just got a little bit of something different maybe, a bit of pace and explosiveness to run in behind that maybe Harry doesn’t have. You saw at Old Trafford when they played the diamond with two up top they were a real threat to Manchester United.
“England have lost Vardy but there will be other players looking on saying “I’m never going to get in the team because Harry is nailed on”.
“But I look at Pochettino and he might have been thinking ‘we need another option’ in case Harry isn’t firing or perhaps because he’s not got that burst of pace.
“He is a phenomenal technician though.
“I’ve heard some people say he’s not that great with his feet but to me his finishing is exemplary.
“You can tell he is relentlessly practised because he can hit the corners better than anyone.
“He’s a terrific finisher and an unbelievable striker but I think that Pochettino does work his players hard.”
Pochettino spent one year on the south coast before Tottenham came calling.
Connolly says the 46-year-old has a reputation for being a tough task master.
He added: “I left Southampton just when he came in and I know Rickie Lambert was saying that he finished him off because his training regime was so hard.
“They very rarely had a day off – there’s nothing wrong with that – but he worked them really hard in the gym beforehand, training was very intense and the manager was happy to be in all day long.
“He lived for his football and he still does. He’s in basically seven days a week, he works really long hours trying to get the best out of his players and it’s a heavy, heavy workload.
“You have seen in seasons past where they’ve fallen away at the end and that’s been levelled at Pochettino.
“I just wonder whether [Kane] did have enough break, mentally as well as physically.
“There’s different types of tiredness. You might be mentally tired, not necessarily physically, but your concentration levels.
“There’s a lot resting on his shoulders and there might be mental fatigue.”