Alexis Sanchez could join several Manchester United stars sidelined during an interrupted pre-season which Jose Mourinho fears will have a lasting effect.
United hoped Sanchez would be one of few experienced forwards on their tour of the United States but the Chile star has been denied a visa after accepting a suspended sentence for tax fraud in Spain earlier this year.
His absence leaves Mourinho with just Anthony Martial and Juan Mata to choose from in attack as Romelu Lukaku, Jesse Lingard and Marcus Rashford remain on holiday after their lengthy World Cup campaigns.
David de Gea, Nemanja Matic and new signing Fred are expected to link up with the squad next week, prior to the first of three International Champions Cup clashes.
"It is really bad. It is really sad, it is not good for us," Mourinho said of Sanchez's situation. "It's not good for anyone, for the team, it's not good for the organisation of the International Champions Cup.
"It's not good for anyone but there is no one to blame. I know the club is making the effort. I have to respect the US authorities in their process of selection for visas.
"Hopefully he will come to join us later because it would be important to at least work with Alexis, Mata and Martial, who are the players I think we have in attack for the start of the season.
"No Lukaku, no Lingard, no Marcus Rashford.
"So if Alexis is not working with us for another 15 to 20 days that will be bad."
United's first pre-season outing sees them meet Club America in Arizona on Thursday, just three weeks before their opening Premier League fixture against Leicester City.
Mourinho bemoaned the preparation "as very bad" despite the enforced opportunities that will be provided to young players.
"They have the chance to know what it is like to be a Manchester United first-team player and to have the chance to play against fantastic teams - Liverpool, Milan, Real Madrid," he said.
"But everything is really bad and then we go to the UK and have to play in the Premier League.
"The Premier League and broadcasters, they were not nice to us by giving us the Friday match [against Leicester]. That complicates things. I would lie if I said I am not worried about it, but it is what it is."
|Alexander-Arnold targets glory at home and abroad|
|Pogba relishing emotional Juventus reunion|
|Alba hopes Lopetegui keeps Real Madrid job|
|Valverde not expecting Messi magical recovery|
|Wozniacki calms fears over knee injury|
|Maybe it´s my interviews - Klopp on Liverpool´s room for improvement|
|Language no barrier to Dortmund dangermen Reus and Alcacer|
|EPCR confirms no replay of Bath-Toulouse Champions Cup fixture|
|F1 Raceweek: Five the magic number as Hamilton eyes Mexico repeat|
|RFU to introduce in-season breaks for players|
|Nainggolan misses Barcelona trip|
|Wozniacki battles through knee complaint to down Kvitova|
|Alcacer: Two seasons at Barcelona not lost|
|Henderson, Keita to miss Liverpool´s Red Star clash|
|Khabib holds talks over Mayweather Moscow fight|
|Wolf in for Titz as Hamburg try to stop slump|
|Davies released from Wales squad as Evans comes in|
|Mbappe on track to match Messi and Ronaldo, says Giuly|
|Coleman, Kipchoge and Lyles among IAAF Male World Athlete of the Year shortlist|
|Serena Williams will win slams again sooner or later, says Seles|
|You always want the best – Ter Stegen open to Neymar return|
|Xavi: My teams will never use Mourinho´s style|
|I knew what I got myself into - LeBron appreciates Lakers are a work in progress|
|Mourinho: Ronaldo loves United but he will want to score|
|Cooper completes Rebels move and takes parting shot at Reds coach Thorn|
|Bellerin amazed by ´born champion´ Ozil|
|Penguins, kangaroos and ´Stone Cold´ Steve Austin: Halloween comes early for Trail Blazers|
|Ronaldo gunning for United, Aguero targets double record - Champions League in Opta numbers|
|Ill Vardy couldn´t stomach penalty decision – Puel|
|LeBron´s Lakers lose again, Magic stun Celtics|
|Bartomeu: No Barca return for Neymar, Valverde contracted until 2020|
|Simmons and ´stimulating´ 76ers in NBA Finals mix, says Longley|
|Falcons heap further misery on Giants|
|Vidic hails Ronaldo as ultimate professional ahead of Old Trafford return|
|Warriors´ Cousins nearing NBA return|
|Pogba can´t do the basics – Souness criticises Man United star|
|Messi absence big blow for Barca as Icardi talks up Inter|
|´You can´t cry, that´s true´ – Ronaldo responds to Isco|
|Bartomeu: Barca still competitive without Messi|
|Bills RB McCoy remains in concussion protocol|
|Raiders place Marshawn Lynch on IR|
|Emery calm over title talk after another Arsenal win|
|Green: Warriors have to clean up defensively|
|Mariners say Bolt talks ongoing amid reports contract offer was rejected|
|Proud captain Ozil revels in Arsenal´s ´sexy football´|
|Puel angry over Holding handball|
|Cilic breezes through in Basel, Anderson fights back|
|Ingram: Four-game ban better than we expected|
|Raiders send Cooper to Cowboys for first-round pick|
|Arsenal 3 Leicester City 1: Outstanding Ozil inspires comeback win|
|World Series 2018: Three reasons why the Dodgers will win|
|Yarmolenko out for six months after Achilles surgery|
|World Series 2018: Three reasons why the Red Sox will win|
|Ozil eclipses Klinsmann to become Premier League´s most prolific German|
|Allegri expecting Old Trafford battle against Mourinho´s United|
|Bertens feared she did not belong in Kerber clash|
|Returning Ronaldo expecting ´tough´ game against Manchester United|
|Cristiano Ronaldo confident of clearing his name amid rape allegation|
|Osaka looking to learn from losing start in Singapore|
|Kovac expects tough test against AEK Athens|
|Whyte gives Chisora deadline over rematch|
|Spartak Moscow sack Massimo Carrera|
|Atletico Madrid confirm fresh injury issue for Gimenez|
|Dolberg extends Ajax contract after Real Madrid links|
|Ronaldo an example for Lukaku to follow|
|Bertens battles back to blast past Kerber|
|Ramos apologises for training ground fracas|
|Raikkonen should take heed of Alonso misfortune as F1 career winds down|
|Guardiola wants Manchester City fans to push team to Champions League glory|
|Isco not interested in departed Ronaldo - he didn´t want to be here|