The 1980s Dell star insists Pochettino's current day side can emulate the success of the famous Saints team that finished second in the top flight almost 30 years ago.
"Watching them has reignited my passion," Armstrong told the Daily Echo.
"It's the first time in 40 years I've seen a side play like we did at Middlesbrough - they close down, they hunt in packs, they pressurise the opposition.
"I'm very pleased to be able to say that for the first time in 40 years I recognised the qualities and the style I grew up with."
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