Gareth Southgate has suffered a dislocated right shoulder while running near England's World Cup base in Repino.
The Three Lions boss was making the most of a day off from training when he sustained the injury, which left him in a local hospital.
Football Association team doctor Rob Chakraverty attended to oversee the treatment and Southgate returned to camp in good spirits but sporting a black sling.
Southgate took his tumble light-heartedly, joking he may not be allowed to show the same kind of emotion on the touchline which accompanied Harry Kane's stoppage-time winner against Tunisia.
"I might not be celebrating any goals as athletically in the future," he said.
"The doc has made it clear that punching the air is not an option.
"I am just a bit gutted because I was on for my record 10k time!"
Southgate's unexpected injury news caused no great disruption to team plans - with a scheduled meeting taking place on time in the evening as preparations for Sunday's clash with Panama continue.
"We are lucky we have a top-class medical team around us, so it was fine," Southgate said.
"I had brilliant help from them, and I am just sorry that I managed to ruin their day off."
Southgate joins Dele Alli on England's walking wounded list, with the Tottenham forward suffering from a quad complaint.
While Alli's fitness is a cause for concern, Southgate confessed his own travails were more a source of amusement among the group.
"It is better this is me than one of the players," he said.
"They were a bit surprised in the team meeting and were asking 'what have you been doing!?' - as always, they were probably quite amused."