Brendan Rodgers' side moved to the top of the Premier League table last weekend, but the 2011-12 champions can leapfrog their title rivals if they win both their games in hand
Due largely to their Capital One Cup, FA Cup and Champions League commitments, City have fallen off the pace at the top - with Brendan Rodgers' side taking full advantage to move four points ahead of the 2011-12 champions.
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City, who have also dropped below Chelsea but have two games in hand on the sides above them, meet Liverpool next weekend in a crucial fixture at the top, and Pellegrini will want to head into that game with a win behind them.
With Liverpool not in action until Sunday, City have a chance to apply some pressure on the Merseysiders and they boast an impressive home record.
Pellegrini's men have made the Etihad a fortress this season, winning 13 of their 14 league games on home soil.
The solitary defeat came against Chelsea in February, but City's response has been to take 14 points from six league games since then.
Pellegrini could be without leading goalscorer Sergio Aguero this weekend, with the striker not having featured since limping out of their Champions League defeat to Barcelona in March.
Pochettino's charges - who earned a 1-1 draw at home to City, when Aguero was on target for the visitors - have found their goal-scoring touch lately, hitting 10 in the last three games.
English trio Jay Rodriguez, Adam Lallana and Rickie Lambert have been Southampton's main source of inspiration, with all three having found the net in Saturday's 4-0 win over Newcastle as they moved back up to eighth.
And defender Luke Shaw - who could join the likes of Lallana, Rodriguez and Lambert in England's World Cup squad - feels the sky is the limit for Southampton.
"I think in the next year or so we can be challenging the top five teams," he said.
"They've got to get the manager down on a long-term contract, which will probably be the first thing they try and do."
Victor Wanyama could return for Southampton following a calf problem, although Kelvin Davis (back), Nathaniel Clyne (groin) and Maya Yoshida (knee) remain sidelined.
As well as Aguero, Pellegrini also has doubts over Micah Richards and Matija Nastasic (both knee).