A player known for his play-making skills and shooting in-front of the goal Rehan was named in the FIH All Stars Team in 2008 and 2010.

Rehan was born in Lahore, Punjab, Pakistan (6 July 1980) as the second child of an ethnic Kashmiri family.

After completing his matriculation from the school Rehan got admission in the Government College University, Lahore based on sports scholarship.

Following year Rehan was in-charge of team selection and for the position of goalkeeper he picked a tall young man, Salman Akbar who went on to play for Pakistan.

Rehan was picked for the senior national team camp the following year under head coach Tahir Zaman but wasn't played for quite a while.

After impressive performances with the junior squad he was selected for the tour of Europe in 2002 where he made his debut in series against Spain.

He was part of the squad for the pre-Olympic tours in Europe where he appeared in different tournaments in England, Spain and series against Germany.

He played in the test series against India later on and in the Champions Trophy at home in Lahore at the end of the year.

Pakistan toured Europe in 2005 where they won the 2005 HockeyRabo Trophy after defeating Olympic Champions Australia in the final.

He scored a hat-trick at the Commonwealth Games in Melbourne, Pakistan finished runner-ups after they lost the final to Australia.

He maintained good individual performances despite Pakistan showing mixed results from disastrous campaigns at the 2010 Hockey World Cup and Azlan Shah Cup but winning the gold medal at the Asian Games for the first time after 20 years, Butt scored a goal in the 2–0 final victory against Malaysia.

After the tour from Europe in July 2011 he was dropped from the team for the remainder of the season because of behavioral issues but Butt denied these claims.