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Manchester United have been told that bringing in a new striker this month will come at a hefty price, with suggestions that their focus should shift to other areas of the squad following concerns over Benjamin Sesko's injury. The Slovenian forward picked up a knock during Saturday's 2-2 draw with Tottenham , being forced off after 85 minutes having only entered the fray shortly before the hour mark. Speaking to reporters afterwards, Ruben Amorim confirmed the injury involved Sesko's knee. "We have to check. He had something in his knee, let's see," the United manager said. "I have no idea. Because it's the knee, we never know. I'm more concerned with an injury because it's in the knee and I don't know. We need Ben to be a better team." The blow has turned United's attention firmly towards the January market, with the club possibly requiring reinforcements up front should Sesko face a lengthy spell on the sidelines. Adding to the setback, Amorim will also be without Bryan Mbeumo , Amad and Noussair Mazraoui owing to next month's Africa Cup of Nations (AFCON). "We have to check everything, we have to check what has happened with Ben," Amorim continued. "Of course, we are going to have a problem there [with AFCON ], but we already knew. "But let's see when the window is open, if we can improve the team and try to prepare something that happened. Until then, we have to take the chance." Addressing the situation on Sky Sports ' Sunday Supplement , journalist Jonathan Northcroft argued that United ought to focus on bolstering their midfield options, pointing out that bringing in a fresh striker would prove 'expensive.' He also revealed: "I was in the press conference and [Ruben] Amorim, as he was leaving the room, he was asked about Sesko's injury so he didn't have time to give a full answer. And he just said 'I'm worried', because when it's the knee, it could be anything." After Amorim suggested during his press conference that the club could buy him 'more midfielders,' Northcroft claimed that would be 'more pressing' for them than signing a new attacker. He went on to explain that United's long-standing issues have centred around midfield 'for years', describing the situation as 'substandard.' Join our new MAN UTD WhatsApp community and receive your daily dose of Manchester United content from Mirror Football. We also treat our community members to special offers, promotions, and adverts from us and our partners. If you don't like our community, you can check out any time you like. If you're curious, you can read our Privacy Notice.