They were suspended in October while Fifa's ethics committee investigates corruption claims against them.
Blatter, 79, is accused of signing a contract "unfavourable" to Fifa and making a "disloyal payment" to Uefa president Platini.
Both men deny wrongdoing.
Platini - who wants to succeed Blatter - has said the 2m euros (£1.35m) payment was "valid compensation" from his time working under the Swiss more than nine years ago.
They were suspended after the Swiss attorney general opened criminal proceedings against Blatter, who has been Fifa president since 1998.
The ethics committee's investigation focuses on allegations around a 2005 TV rights deal between Fifa and Jack Warner, the former president of Concacaf, the governing body of football in North and Central America and the Caribbean.
Blatter was discharged from hospital last week after what was described as a "small emotional breakdown".