Gary Neville has detailed the four positions Manchester United must improve in this summer.
United are unbeaten since January and have taken 17 points from a possible 21 since the Premier League resumed to move into a strong position in the race for a top-four finish.
However, United are still a long way behind champions Liverpool and Neville believes they will need to be active in the summer transfer window.
"Definitely a centre-back, definitely a centre-back," Neville told the Webby & O'Neill podcast when asked where United need to strengthen.
"A challenge for David de Gea, a right winger and a centre-forward. In my opinion."
Delving into his reasoning, Neville added: "It's not to replace [Anthony] Martial, it's to challenge Martial.
"It's meaning that [Mason] Greenwood doesn't have to play right wing all the time.
"I do think the club need a winger who maybe could play both sides personally. I think they do need a centre-forward.
"In 1999 we had [Teddy] Sherringham, [Andy] Cole and Solskjaer in the building and Sir Alex Ferguson signed Dwight Yorke to challenge them, to complement them, to play with them. Not to replace them.
"You can sign a player in the same position as another player without disrespecting them if that player has got the right attitude."
