Manchester United are facing a defensive crisis on the eve of their crucial Champions League trip to face Como.As the rain came down at Carrington, boss Michael Carrick observed a training session which featured just one senior centre back that has played this year in Harry Maguire.Lisandro Martinez, who was forced off at half-time away at Leeds United with a thigh issue, was held back from Tuesday’s session, and Carrick confirmed that the Argentine star did not travel to northern Italy later that day. ‘Bit of a mixed bag, we’ve got quite a few missing,’ Carrick said in his pre-match press conference. ‘Licha’s is not that bad, but he is not with us. ‘Kobbie (Mainoo), we’re looking at another 10 days or so, and Luke (Shaw) a little bit longer than that. We have a bit of illness and injuries. Ayden (Heaven) is ill. Marcus (Rashford) is still feeling a hip issue that we’re trying to overcome. Leny Yoro sat the session out owing to his suspension after a red card in last week’s 2-0 defeat by Atletico Madrid. He is understood to be focusing on an individual training session today.Heaven, who also missed the trip to Leeds through illness, was another defender absent from training. Shaw and Patrick Dorgu remain longer term absentees, meaning Carrick is contending with five defensive injuries, all while Matthijs de Ligt, who did train, works his way back to full fitness having not played since November 2025. Lisandro Martinez was forced off at half-time of United’s 1-1 draw at Leeds on Sunday Marcus Rashford came on in the closing stages of the game but did not train this morningRashford had been another major doubt to be on the flight, as he continues to deal with a hip problem.Mainoo has not played since the 1-1 draw at home to Tottenham Hotspur and he remains sidelined.The big question now is who will be able to play in defence, especially given Carrick pivoted to a back five system for the 1-1 draw at Leeds.Diogo Dalot and Noussair Mazraoui represent the only options at full-back – Harry Amass and Jaydan Kamason both trained with the first team but are unlikely to be called upon – while Maguire’s centre back partner is at this stage up in the air. Academy centre back Dan Armer, who was on the bench in Madrid, was also in the session.United badly needed defensive reinforcements in the summer but dedicated their budget to bolstering the midfield following the sizeable exit of Casemiro.That gamble not to bolster the back-line is coming home to roost now with the Como trip a major test of the squad depth with Carrick potentially needing to thrust De Ligt back into the mix after 11 months out. MAN UNITED’S MISSING Ayden Heaven – ILL Lisandro Martinez – INJUREDKobbie Mainoo – INJURED, NEEDS 10 DAYS Luke Shaw – INJUREDLeny Yoro – SUSPENDEDPatrick Dorgu – HAMSTRING ISSUEManuel Ugarte – LONG-TERM KNEE INJURYMarcus Rashford – HIP ISSUEBenjamin Sesko – SHIN ISSUE <!- – ad: https://mads.dailymail.co.uk/v8/us/sport/football/article/other/mpu_factbox.html?id=mpu_factbox_1 – ->