Manchester United need more quality in their squad to challenge for the big titles next season. United have been left licking their wounds after returning from Germany following a crushing 2-1 defeat to Sevilla in the semi-finals of the Europa League.
Ole Gunnar Solskjaer 's men lost three semi finals this season to leave the United boss still searching for his first silverware since taking charge.
United have not won a trophy since 2017 when Jose Mourinho was in charge - and Berbatov believes Old Trafford chiefs need to add more strength in depth for this to change.
The former United favourite told Betfair : “The defeat showed that United need to strengthen. “They need a centre back for sure.
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