The following season with Al-Ahli, Ahmed won his first club honour, the President Cup, and was the top scorer with four goals.

[10] In 2010, Ahmed continued his outstanding performance, by leading UAE Olympic football team to win the 2010 GCC U-23 Championship by scoring five goals in the tournament and win the top scorer,[11] and for the first ever football silver medal in UAE history at the Asian Games[12] and scored three goals in the tournament.

He was named the Best Young Athlete Player of the Year by Mohammed Bin Rashid Al Maktoum Creative Sports Award.

His father, Khalil Sebait, is a former player for an old football club during his time in Kuwait and his brothers Fahd, Fouad (Retired), Faisal, Fathi, Mohamed, and finally Ahmed, all of whom played for Al Ahli.

[16] Ahmed started his career in the Red Fort at the age of eight,[16] and included in the youth teams until he reached the first team, in the middle of the 2006–07 season under French coach Alan Michel[17] On 13 May 2007, (at 16 years) in 89 min and 3 sec, Ahmed scored his first goal for the club and in the league, in a 4–1 victory over Al Wahda.

[19] On 30 March 2010, against Al-Hilal in the AFC Champions League, Khalil scored a goal in the 42nd minute, before the end of the first half.

[32] Ahmed started the season with Al Ahli by beating Kazma 1–0 in the first leg of the GCC Champions League Semi-final.

[33] Starting from summer 2017, Ahmed joined Al Jazira Club on a free transfer deal.

In 2008, in Dammam, Saudi Arabia, with under-20, he was part of a team that won the 2008 AFC U-19 Championship and was a factor by scoring two winning goals in the final against Uzbekistan.

Perhaps his most successful year was the 2010, in which he led the Olympic team to win the 2010 GCC U-23 Championship and was the top scorer with five goals of 4 matches.

Khalil was named in United Arab Emirates' final squad for 2015 AFC Asian Cup, held in Australia.