The Argentine has signed a five-year deal at White Hart Lane, having resigned from his position at St Mary's, and has thanked the Saints for his time at the club
It was announced on Tuesday that the Argentine would succeed sacked Tim Sherwood at White Hart Lane, with the 42-year-old signing a five-year contract.
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They were then one of the success stories of the 2013-14 campaign, finishing eighth.
And, following the announcement of his move, Pochettino released a statement via Southampton's official Twitter account to express his gratitude to the club.
"I would like to thank everyone at Southampton for the support that myself and my coaching team have received during our 18 (sic) months at the club," he said.
"We have been on an incredible journey and enjoyed some great experiences.
"I will always have fond memories of my time at St Mary's and wish everybody the best for the future. I hope the team can continue to prosper."