The striker’s current deal runs to June 2018 and last week Calenda announced that Lazio had agreed a transfer fee with Milan.
However, the Biancocelesti maintain Keita is turning down a San Siro switch because of an approach from Juve.
“(Lazio director Igli) Tare talks about my non-existent agreement with other clubs and publicly waves around fairy-tale renewals,” wrote agent Roberto Calenda on Twitter this afternoon.
“However, seeing as now he is also talking about renewals worthy of a top player or offers from three big clubs, perhaps it’s time he informs us of this too…
“We remain, as ever, waiting for Lazio!”
See the latest Serie A predictions and betting tips with Eurotips.co.uk