2017–18 Indian Super League

The 2017–18 Indian Super League season was the fourth season of the Indian Super League, one of the top Indian professional football leagues. It was established in 2013. The regular season started on 17 November 2017 and ended on 4 March 2018, The Playoffs began on 7 March 2018, concluding with the final on 17 March 2018. ATK were the defending cup winners from the 2016 season, however they could not advance to the playoffs. Chennaiyin won their second Indian Super League title by defeating Bengaluru 3–2 in the final.
Two new sides joined the league as expansion teams: Bengaluru and Jamshedpur. The two new clubs are the ninth and tenth teams in the league. This made it the first edition of the ISL in which there are more than eight teams participating. As well as expanding two teams, the league also expanded two more months, being played in five months instead of three. Away goal rule is introduced in semifinals stage in this season.

Teams

Stadiums and locations

Expansion

On 11 May 2017, it was announced by the Indian Super League organizers that they would be inviting bids for new teams to join the league for the upcoming season. The bids would be for ten cities, namely Ahmedabad, Bengaluru, Cuttack, Durgapur, Hyderabad, Jamshedpur, Kolkata, Ranchi, Siliguri and Thiruvananthapuram. It was also clarified that if Kolkata were to win at least one bid for a team, the new "Kolkata" side would have to play away from the city for two seasons.
On 25 May 2017, it was announced that bidding for new teams had ended and that the league's appointed external validator would look over the bids. It was also announced that Bengaluru, the two-time champion of the I-League, India's top-tier professional football league, had submitted a bid. Two weeks later, on 12 June, it was officially announced that Bengaluru and Tata Group had won the bids for the new teams.

Overseas players

Unlike during the first three seasons of the Indian Super League, the 2017–18 season saw the maximum number of foreign players per team reduced to eight from 11. Also unlike the previous three seasons, the maximum number of foreigners allowed on the pitch at the same time was reduced to five from six.

ATK

Bengaluru

Chennaiyin

Delhi Dynamos

Goa