Petkovic is said to be experimenting with a three-man defence despite missing two centre-backs (Biava and Dias are both suspended).
Konko would therefore play further up, moving Candreva into the middle and allowing Mauri to be the link between the midfield and Klose.
The line-up can easily switch back to the usual 4-5-1 as Radu will play in the defensive trio.
The managerial change had an impact in the short term after the point gained in Turin against Juventus, but now Ballardini has a tough task to face as Lazio travel to Genova.
The points dropped in the last two rounds could have made Petkovic think about the real aims for this season: the Coppa Italia is achievable and a Champions League's play-off spot looks more likely than a challenge for the title.
The visitors may be a little tired after the draining match against Juventus that cost them in both a physical and psychological sense. Lazio may therefore leave ball control to Genoa in the first half of the game, try to keep it in the balance and then attack in the second half, hoping that their opponents begin to tire.
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