Pollock, who scored two tries on his England debut against Wales in Cardiff last year, will lead the charge as Saints hunt a home tie in the last 16.
The back-row forward is in his second season as a professional but has already become one of the game’s most recognisable figures and a pantomime villain.
The Lions tourist responded to jeers of the Bordeaux crowd last weekend with a double – the first a remarkable chip, chase and gather down the left wing – and Scarlets will be wary of his explosive carrying.
However, the Saints also boast a formidable matchday squad that includes England internationals Alex Mitchell, Tommy Freeman and Fraser Dingwall.
“There are 14 other guys on the pitch that you’ve got to worry about,” added Macleod.
“If we went in with a mindset of worrying about one then we’re going to get lost along the way.”
