Indian Arrows After the FIFA U-17 World Cup concluded, Gill was selected to be part of the
Indian Arrows, a developmental side owned by the
All India Football Federation which was to play in the
I-League. He appeared on the bench in the Arrow's first match of the season on 29 November 2017 against
Chennai City, being the back-up to
Dheeraj Singh Moirangthem. On 2 January 2018, Gill's 17th birthday, he made his professional debut for the Indian Arrows against
East Bengal due to Moirangthem leaving the club. He gave up two goals early in the match as Indian Arrows fell 2–0. Arrows Head Coach
Luís Norton de Matos was impressed with Gill's performance saying "I think it is a new process for goalkeeper Gill who is 16 years old. He made a fantastic save in the second half. The team needs to protect the goalie."
Bengaluru FC He was signed by
Bengaluru in 2019. He made two appearances for the club which includes a match against
Paro FC in the
AFC Cup Qualifier.
Kerala Blasters 2021–22 season: Debut season and ISL Golden Glove On 9 September 2020,
Kerala Blasters announced the signing of Gill on a two-year deal. During his first season with the club, Gill did not made any appearances in the Super League as he was used as a back-up keeper for
Albino Gomes. He finally made his Blasters debut on 21 September 2021 against
Delhi FC in the
Durand Cup, which they lost 1–0. He made his league debut on 5 December in the 2–1 victory over
Odisha FC, where he was substituted in for
Albino Gomes, after Albino was contracted with an injury. Gill then became the first choice keeper for the Blasters as Albino was ruled out of action for an indefinite period of time. On 12 December, he started for the Blasters in ISL for the first time in the next match against SC East Bengal in a 1–1 draw. Gill kept his first clean-sheet on 19 December against the defending champions
Mumbai City FC in a 0–3 victory. He kept a clean-sheet again on 22 December in the next match against rivals
Chennaiyin FC, which they won 0–3, repeating the same feat of the previous matchday. Gill had his first clean-sheet of the year 2022 in their match against
SC East Bengal on 14 February, which they won with a score of 1–0 at full-time. His performance in the month of February earned him the ISL's 'Emerging Player of the Month' award. Gill was awarded with the
Golden Glove of the
2021–22 Indian Super League. In twenty matches played, he managed to keep seven clean sheets, made 47 saves and conceded 21 goals. This was the best goalkeeping performance by a Kerala Blasters goalkeeper in the last five years.
2022–23 season: Contract extension After a good individual season, Kerala Blasters announced that Gill had signed a two-year contract with the club till 2024. On 19 November, Gill kept his 9th clean sheet for the Blasters in a 1–0 away win against
Hyderabad FC and surpassed
Sandip Nandy to become the all-time highest clean-sheet holder for the club.
East Bengal On 11 July 2023,
SC East Bengal announced the signing of Gill for a reported transfer fee of ₹1.2 crore, the highest for an Indian goalkeeper, on a three-year deal. ==International career==