His first inclusion in Admira II's matchday squad was as an unused substitute against Wiener in week 16 of the 2011–12 season in the Austrian Regional League East on 2 March 2012. The following week he made his debut in the starting XI playing the first 55 minutes before being replaced by Daniel Maurer in a 1-0 home win against SV Schwechat. In the third consecutive game, Bytyqi played again and as a starter on 16 March 2012 against Neusiedl am See 1919, which finished in a 4–1 loss, where he was substituted off in the 75th minute for David Peham.
On 24 September 2014 Bytyqi made his debut with the Manchester City first team in a match on the 2014–15 Football League Cup against Sheffield Wednesday, which finished in a 7–0 victory. Bytyqi was an unused substitute and held the shirt number 75. After fellow Albanian player Bersant Celina, was provided a professional contract with Manchester City, on 9 January 2015 Bytyqi also signed a professional contract and subsequently was loaned to the Netherlands team Cambuur, which finished the 2014–15 Eredivisie in the seventh place, which ensured participation in the UEFA Europa League. Unfortunately, Sinan's time in the Eredivisie was cut short when he sustained an injury in a game against Heracles Almelo in the spring. He made his long-awaited comeback for the EDS against Southampton F.C. in December 2015, helping the team finish out a strong season.
Loan at Cambuur
On 17 January 2015. Bytyqi made it his first debut in professional level with Cambuur in a 2–2 away draw against ADO Den Haag, coming on as a substitute for Daniël de Ridder in the 64th minute. On 28 February 2015, he suffered a season ending knee injury in a match against Heracles Almelo which sidelined him for approximately six months.
He was again loaned to a Dutch club in summer 2016, joining Go Ahead Eagles. He injured his ankle after only a few games and did not return after he was diagnosed with heart problems in December 2016.
Retirement
Following a diagnosis of hypertrophic cardiomyopathy, Bytyqi made the decision to retire from professional football, and took up a position as a loan scout for Manchester City.
