A deal is imminent with Eintracht Frankfurt for Djibril Sow, but Lazio are also reported to be in advanced talks with Dinamo Moscow for Arsen Zakharyan, which would be a problem for Callum Hudson-Odoi.
The Biancocelesti have moved very slowly to replace Sergej Milinkovic-Savic in midfield, despite needing to reinforce the squad after qualifying for the Champions League.
According to Sportitalia, a deal is essentially done worth €15m plus bonuses for Eintracht Frankfurt midfielder Sow.
Meanwhile, Sky Sport Italia are confident that Lazio are also on the verge of securing Zakharyan from Dinamo Moscow.
The Russia international only turned 20 in May and has been linked with Chelsea, Ajax and Feyenoord as well this summer.
His contract with Dinamo Moscow only runs to June 2024 and the deal is likely to be struck for circa €10m plus €4m in bonuses.
However, as he is a non-EU player, that would take up the only remaining slot in the squad.
If the current rules stay as they are, then that means Lazio would also be unable to bring in Hudson-Odoi from Chelsea, as after Brexit the UK players are no longer part of the European Union rules on freedom of movement.
That could change, as the FIGC has made a formal request to consider the UK players part of the EU for registering them this summer.