Robert Huth is already suspended for Tuesday’s return with Atletico Madrid after his latest caution in the controversial 1-0 first leg loss on Wednesday.
And lynchpin Morgan, who has missed the Foxes ‘ last five games with a back injury, remains a major doubt.
The duo were the first-choice pairing for the Premier League champions last season. with colossus Morgan playing every single game.
- Fernando Torres talks about playing with Steven G0:55
- Fans run onto the pitch for safety after trouble 0:19
- Ronald Koeman hits back at Didier Drogba over Luk0:21
- Manchester United fans in boisterous mood in Brus0:18
- Swimsuit model Mia Kang going through her paces a0:19
- Who’s your favourite TV pundit?2:03
- Jurgen Klopp confirms new Steven Gerrard role at 1:11
Roy Keane doesn’t rate Leicester’s chances in second leg
Following Huth’s suspension, boss Craig Shakespeare is desperate for the 33-year-old to play in the match that will decide who goes through to the semi-final.
After seeing his men beaten only by Antoine Griezmann’s disputed penalty, Shakespeare admitted: “We need Wes ready.
“It is whether needs must. We will have to have a look at it but, ultimately, I would never ask a player to play when he is not 100% fit.
“Wes is taking more time than he thought and we thought so we will have to assess him very carefully over the next few days. If he isn’t ready, then we will have to look at replacements.”
In Morgan’s absence, goalkeeper Kasper Schmeichel took the armband and helped marshal a brave rearguard action in a game where Atletico had 68 per cent of the possession and Leicester failed to muster a single effort on target.
Morgan did travel to Madrid with the squad, but Tunisia international Yohan Benalouane — who finally made his first Premier League start on March 18, 19 months after joining the club — again deputised.
Daniel Amartey, the 22-year-old Ghana international who generally plays in midfield for the Foxes, is the most likely stand-in alongside Benalouane in what would be brand-new centre-back pairing for arguably the biggest game in the club’s history.
Schmeichel said: “Wes and Huthy are obviously massive characters and very influential on and off the pitch.
“From a personal point of view, I am gutted for both of them.
“Wes missed out on a great occasion for the club at Atletico as he should have been leading the team out.
“Huthy is another big miss, and I am gutted for him but it gives someone else a chance.
“We have seen with Yohan coming in for Wes, he has done a great job. He was brilliant. He has slipped right in and did fantastic.
“You have a squad to use the strength in depth and we are going to have to do that.”