Dimitar Berbatov has praised Manchester United for signing Donny van de Beek but says the club must now push on with adding even more players in the summer transfer window.
Dutch midfielder Van de Beek became the club's first summer arrival earlier this week after signing a five-year contract with the option of an additional year following his £34.6m transfer from Ajax.
Van de Beek brings added strength to a midfield already packed with talent and Berbatov believes the focus should now be on bolstering other areas of the pitch.
"It’s getting crowded in the midfield department but that’s a good thing because competition is always healthy," Berbatov told Stadium Astro.
"They will get the best out of each other. ‘There is going to be Pogba, him and Bruno Fernandes – that is exciting. The team is getting compact in a really nice way. Maybe they will surprise us with one or two more signings.’"
When pressed on which area United need to strengthen next in the summer window Berbatov reiterated his desire to see a new centre-back added to the squad.
He continued: "I think in defence, a centre-back is something that they need to look for.
"If they are going to buy someone or not we are going to see, but I think that is where they need to strengthen. Everything else at the moment looks balanced.
"For me they need someone who can accommodate Harry Maguire. Harry is more of a guy for getting the ball out of the defence and giving it to the midfield, so maybe someone who is different to that but also strong.
"They need to copy the Rio [Ferdinand] and [Nemanja] Vidic partnership from the past."
