Kobbie Mainoo is set to sign a new five-year contract with Manchester United . The club are likely to announce the midfielder’s new deal later this week, giving them a boost before Sunday’s clash with Liverpool. And it will cap the turnaround in Mainoo’s fortunes after he was considering leaving on loan when he was marginalised by former head coach Ruben Amorim . But the Mancunian has become a pivotal player under Michael Carrick , forming a fine partnership with Casemiro and all but ensuring United will qualify for next season’s Champions League. Amorim did not give Mainoo a Premier League start this season but he has begun 12 games under Carrick, with United taking 29 points from them. Mainoo has little over a year left on his current deal while his new contract, which could keep him at Old Trafford until 2031, is set to contain a pay rise. The England international, who made his debut in 2023, has made 98 appearances for United, scoring seven goals.…