Fifa president Sepp Blatter says 2022 World Cup hosts Qatar must do more to improve conditions for migrant workers.
The treatment of construction workers in the Middle Eastern state has been criticised by human rights organisation Amnesty International.
Blatter noted that some human rights groups reported "progress" had been made, but said "more must be done".
Fifa is expected to ratify a decision to move the tournament from summer to winter at a meeting on 19 and 20 March.
The head of world football's governing body was speaking after meeting Qatar's Emir Sheikh Tamim bin Hamad Al Thani in Doha to discuss the country's efforts to improve conditions for workers building the stadiums and other projects for the tournament.
More than 180 migrant workers died in Qatar in 2013, and in May 2014 the government pledged to reform the restrictive kafala system of sponsorship - in which employers effectively own labourers and control their freedom to leave the country - and promised to implement proposed changes "as quickly as possible".
The promised reforms are yet to materialise, but Blatter said: "It is encouraging to hear the Emir's personal commitment to workers' welfare and to get a sense of the improvements planned for all workers in Qatar.
"It is clear that Qatar takes its responsibility as host seriously and sees the Fifa World Cup as a catalyst for positive social change."