German midfielder dislocated his knee last month and expects to miss start of Premier League season for Pep Guardiola's side
But Gundogan is relishing working with Pep Guardiola, admitting he looks up to one of his new boss’ favourite players – Barcelona and Spain legend Xavi.
But the new recruit soon won back his place, slotting in alongside Shinji Kagawa, Mario Gotze and Kevin Grosskruetz, making 28 league appearances in his first campaign.
In the fourth Bundesliga game of his career, a teenage Gundogan more than matched Bayern Munich's Bastian Schweinsteiger, serving notice of his considerable potential.
He's never been prolific for club or country, but given the opportunity to stretch his legs Gundogan is a real threat in the opposition half.
As you can see, they target the player with a little goad about his "current knee injury" (way to rub it in!), before they get their claws stuck in the City.
Under new manager Thomas Tuchel, he's often deployed in a slightly deeper position, a move that partly explains his single league goal in the 2015/16 season. But the 25-year-old is keen to bring the ball forward, with 2.2 successful dribbles on average per game.
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As reported exclusively by SunSport, Gundogan was given a guided tour of City’s football academy a fortnight ago despite having to hobble around the complex.
So with a move secured, what could we expect from Gundogan in England?
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The former Borussia Dortmund star will miss the start of City's season through injury, the latest problem after a host of setbacks
"The midfielder... will leave the eight-time German champions to join Manchester City, who finished fourth in the Premier League last season," it states.
His 87.8 per cent pass completion mark is among the best in the league, and he's effective going the other way too. He has averaged more than two interceptions per game in all competitions, a figure comparable with Victor Wanyama and Mark Noble.
But it was Dortmund who rinsed both Ilkay and Man City themselves with the announcement they posted on Facebook:
The player has also revealed he hopes to bounce back from injury by late August, explaining: “I hope to be fit by the end of August or first week of September.
Gundogan's penalty threatened to send the Wembley final to extra-time before Arjen Robben struck late, and that disappointment was only compounded by a nightmare 2013/14.
Taking so many chances in possession requires trust from the manager, and despite the high number of dribbles, Gundogan is only dispossessed once per match on average. Aaron Ramsey, Ross Barkley and Dele Alli give it away at least twice.
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“I may miss a couple of matches but that’s fine because I want to be ready for when I play my first game.”
Mum and dad accompanied Gundogan as he took in the options on offer, and the midfielder will be hoping his new luxury pad helps with his rehabilitation.
And with almost 50 league appearances under his belt before his 21st birthday, Dortmund's Klopp came calling. He initially struggled to replace Nuri Sahin, the Bundesliga Player of the season had departed for Real Madrid, and was briefly benched. "It was a tough time," he admitted. "Things hadn't gone as well as I had thought, and the coach was right to take me out of the team and protect me."
The £21million Manchester City man is stepping up his recovery – but will miss the start of the the campaign after dislocating his kneecap at Borussia Dortmund – and was keen to keep his social media followers up to date with his progress.
Back at club level, Dortmund struggled to find their fluency without Gundogan, leading Klopp to admit as much shortly before his return in late 2014: "The day he makes his comeback to action will be a great day for everyone."
“You can’t be absolutely sure and we gauge it week-by-week but that’s my target and if everything goes to plan it will be August.
As per the norm, the transfer was announced by both respective parties. But the tone of the announcements were very abnormal.
Sporting a brace on his right knee, the 25-year-old eagerly peered through the windows of Leaders estate agents, which specialises in city centre apartments.
As of this minute, City are unwilling to pay a British record fee for Aubamayeng but their stance could change if Pep Guardiola insists on the striker's arrival
Age: 25Date of Birth: 24/10/1990Nationality: GermanClub: Borussia DortmundPosition: MidfielderHeight: 5ft 11in (180cm)Weight: 12st 4lb (79kg)Preferred Foot: Right
His energetic style powered Dortmund's thrilling counter attacks under Klopp, a trait well suited to the fast-paced Premier League, and it's this ability to impress across key areas that stands him in good stead. A team with Gundogan very often dictates tempo and urgency, an underrated skill, but he's no gung-ho attacker.
Well and truly back to his best this season, according to WhoScored, Gundogan has been one of the top 15 players in the German top flight.
Gündoğan, İlkay - Man. City (ENG)
"Gundogan is willing to learn and is very smart," said then Dortmund manager Klopp in 2011. "He also brings a great attitude. Ilkay has a great passing game, is a complete player, and fits perfectly into our footballing system."
Dortmund strolled to their fifth Bundesliga title and second in as many years, finishing eight points clear of rivals Bayern, with Gundogan the link as Klopp's core of young German players ran riot.
He missed more than 80 games in all, only returning to first-team football that October as Dortmund finished a disappointing seventh in Klopp's final season in charge.
The signing of 25-year-old midfielder Gundogan was announced on Thursday morning, on a four-year deal for a fee understood to be £21m.
Now one of Europe's premier midfielders, Gundogan worked his way to the top, serving apprenticeships in VfL Bochum's reserve team and FC Nurnberg.
History was made at Manchester City this week as midfielder Ilkay Gundogan became the first man to sign up to the Pep Guardiola era at Eastlands.
First up, City: their social media team knocked up some hilarious (and definitely not rehearsed...) tweets, where Gundogan himself tweeted the club, "ANNOUNCE GUNDOGAN!". So they did.
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"I think he is back to where he was two years ago," said Germany national team coach Joachim Low. "[He's] an extremely valuable player, he's very agile, he makes smooth runs, is quick on the turn and I'm very glad to have him as an option."