Martial was taken off after 72 minutes during the 4-1 thrashing of CSKA Moscow.
Rio Ferdinand feels Jose Mourinho's team need to mirror Real Madrid and Barcelona's all-conquering sides.
Diatta has been scouted by United on more than one occasion.
United beat CSKA Moscow 4-1 on Wednesday, making it eight wins in the last nine games in all competitions.
Lukaku has scored 10 goals in all competitions so far, which includes six goals in the Premier League.
Mourinho says Manchester United made it look easy against CSKA Moscow.
United eased to a 4-1 win away in Russia with the Frenchman on the score sheet.
Anthony Martial and Henrikh Mkhitaryan also on the score sheet on easy night in Russia.
Beckham left Old Trafford for the Santiago Bernabeu in 2003 after 11 years in Manchester.
France centre-back will continue at the Santiago Bernabeu until 2022.
Ballon D'or winner only signed a new deal worth around £365.000-a-week in November 2016.
United and City have enjoyed a good start to the 2017/18 season.
CSKA Moscow coach Viktor Goncharenko expects tough test against Red Devils in Champions League.
Ibrahimovic suffered a severe knee injury playing against Anderlecht in the Europa League in April.
The 27-year-old suffered a concussion on the weekend but is expected to recover in time.
Jose Mourinho will be without seven senior players for Wednesday's Champions League visit to CSKA Moscow.
Eric Bailly is eligible to feature in the Champions League after serving his three-match suspension.
However, Nemanja Matic has travelled after sustaining a knock in Saturday's win over Southampton.
54-year-old was sent to the stands during final minutes of a 1-0 Premier League victory at St Mary's on Saturday.
De Gea, 26, has two years left on his current Red Devils contract.
Defender's deal had been set to expire next summer.
Ferdinand will look to gain a BBBofC license and compete for a title as part of 'Defender to Contender' project.