Alex Ferguson will wait for an X-ray on Wes Brown's injured ankle knowing his defensive resources are badly stretched ahead of the Premiership opener with West Brom on Saturday.
Brown lasted just six minutes of last night's shock 1-0 Champions League qualifying defeat to Hungarian unknowns Zalaegerszegi in Budapest after coming off worst in a challenge with Igor Budisa.
With Rio Ferdinand, Gary Neville and Fabien Barthez already set to miss the visit of the newly promoted Baggies, Ferguson has little option but to stick with the back four that failed to keep out the Hungarian minnows.
"Wes was in a lot of pain and there is definitely tendon damage," said Ferguson. "He will have an X-ray to see if there is a break but at this stage we don't know the full extent of the problem".
Bela Koplarovic's last-minute winner created the biggest story in Hungarian football since the national team qualified for the World Cup in 1986.
Brown's replacement, Phil Neville, failed to deal with a routine clearance, allowing Tamas Szabos to charge down the left wing and provide the low cross which Koplarovic bundled home to send the home fans wild.