"I haven't trained for three weeks. I need to come back bit by bit," he told reporters after the race on Tuesday.
The former world record holder was suspended, along with training partner Sherone Simpson, for 18 months by a Jamaica Anti-doping disciplinary panel after both tested positive for a banned stimulant.
They claimed the substance had been in a contaminated food supplement.
The suspension was reduced to six months on appeal at the Court of Arbitration for Sport (CAS) and expired on Monday.
Powell's last competitive outing came at the Lausanne Diamond League meeting in July last year.
(Reporting By Tony Goodson)
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