Playing for the
India national team, Mewalal's first major tournament was the
1948 Summer Olympics in
London. As part of the preparation for Olympics, he went to Europe with the national team in July, that won matches against English teams like
Pinner F.C.,
Hayes F.C. and Alexandra Park FC. In the Olympics, Indian team managed by
Balaidas Chatterjee, went down 1–2 to
France. Following the Olympics, the
Talimeren Ao led team played
exhibition games, winning a game against the Dutch club
AFC Ajax 5–1. He emerged as the top scorer in these games. Mewalal became part of the prominent Indian team during the "golden era" of Indian football, managed by Hyderabad City Police head coach
Syed Abdul Rahim, became one of the best teams in
Asia. In March 1951, at the inaugural
1951 Asian Games in
New Delhi, he finished as the top scorer with four goals, with India winning the gold medal. Mewalal and his team defeated
Iran 1–0 in the gold medal match to gain their first trophy. He was also a part of the team that competed at the
1952 Summer Olympics in
Helsinki. He was also part of the national team that toured to several European countries in the late 1940s and played against teams like Denmark, Austria, Switzerland, in which he netted six goals. He later participated in the team's tours of
Bangladesh,
Afghanistan,
Myanmar, and
Thailand during the 1950s. ==Managerial career==