Klose signed a two-year contract after becoming a free agent from Bayern Munich.
"More players of that level will arrive at Lazio," declared Lotito. "We have mapped out a plan of signings to make the squad more competitive.
"The first was Klose, who I believe holds the right technical and moral values we are looking for.
"Other negotiations are continuing with different players, even if I don't want to name names at this moment.
"We are interested in improving every area of the team and will do so in concrete fashion."