Hooper was a huge hit during his time at Celtic between 2010 and 2013, netting 63 goals in 95 appearances.
He subsequently moved to Norwich City and Sheffield Wednesday where he was also a hit in the English Championship.
"The deal is subject to international clearance and more details will be announced in the coming days." Lazio started their campaign with a 1-1 draw with Atletico Madrid while Celtic lost 2-0 to Feyenoord.
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