The Problem is muscular.
2-0 at half-time and the Premier League champions were cruising. "It was easier at the back because we played as a team and the guys up front closed down the space", Fernandinho told BT Sport after the game.
"I've been training in this position since the start of the season", said Fernandinho, who made two interceptions and had a passing accuracy of 90% against Shakhtar.
City pressed Shakhtar from the outset and Rodri should have done better when De Bruyne's cross hit the back of his head. More so when up against a Shakhtar Donetsk that City thrashed home and away at the same stage past year.
But City's injury woes got even worse earlier this week when it was reported Stones could be out for 4-5 weeks.
Zinchenko will continue at left-back in the Manchester City lineup.
'There are a few players who don't play that much but I want them to.
Mikel Arteta was strongly linked with the Arsenal job before Unai Emery’s appointment
The 25-year-old is now out of action for a few weeks after sustaining an injury in training earlier during the week, and his absence has dealt a huge blow on manager Pep Guardiola's plans.
Elsewhere, last season's Champions League finalists Tottenham open their Group B campaign with a trip to Greece's Olympiakos today.
Kyle Walker also did not escape censure for his shaky display on Saturday, with Guardiola keen to hand Joao Cancelo, the world's second most expensive full-back at £60 million (S$102.7 million), his debut since making the switch from Juventus in the summer.
Manchester City have won three of their previous four UEFA Champions League meetings with Shakhtar Donetsk (L1) and have outscored their Ukrainian opponents by 12-2.
The departure of veteran stars such as Franck Ribery and Arjen Robben seemed to confirm the end of an era, but Coutinho's arrival on loan from Barcelona has prompted fresh hope that Bayern can be restored as one of the continent's most feared sides.
According to Opta, Shakhtar's 15 goals conceded vs City is the most goals they have conceded against any side in the Champions League. "They gave me all the prestige I have in England", he said after the Norwich game.
CNN Weather TS Humberto forecast to be hurricane Sunday
The Bahamas Prime Minister Hubert Minnis said on Wednesday the official death toll stood at 50 but was expected to rise. The National Hurricane Center is warning that a tropical storm could hit areas already flattened by Dorian.