Manchester United boss Ole Gunnar Solskjaer will hope to strengthen his squad when the transfer window reopens. Given their struggles this season, it may be the only way to save his job. The 46-year-old is under pressure at Old Trafford, just seven months after he was given the managerial job on a permanent basis following a successful interim spell as manager. Manchester United need reinforcements. Their current squad isn’t good enough and Solskjaer knows it. He is hoping to tread water until January before hoping for a rubber ring to be thrown his way. And he may get a glorious chance to strengthen his squad this summer – thanks to Juventus. Express Sport understands Mario Mandzukic’s camp have already approved the Croatia international making the move to Juventus. And, given his fine goalscoring record, the Croatia international would represent an upgrade on Marcus Rashford in the No 9 role. Mandzukic is a striker who has been operating at a high level for a number of years, dating back to his time at Bayern Munich. During his time at the Allianz Arena he wasn’t always first-choice. Particularly when Robert Lewandowski touched down from Borussia Dortmund. But Mandzukic scored some big goals…