MILAN, Jan. 5 (Xinhua) -- Inter head coach Walter Mazzarri warned his side to be cautious of Lazio who welcomed the arrival of Edy Reja.
Reja, who replaced Vladimir Petkovic, will sit on Lazio's bench when the Rome side host Inter on Monday.
Mazzarri insisted that Reja could rejuvenate Lazio and bring trouble to Inter.
"I don't think this change of management was an advantage for us. Lazio were struggling in their last game at Verona with a performance not up to their quality," he said.
"With Reja arriving and with his knowledge of the players, he can turn them around."
Mazzarri said Reya could use his talent and experience to bring Lazio back to life.
"I think an experienced and talented coach like Reja can unite the club. He knows them well, as he was there only two years ago. I hear they have already rediscovered their enthusiasm," he said.
"Lazio have excellent players and if they play the way they can, then they'll cause anyone problems, so it will be a difficult game and an important test for us," he said.
The Inter coach expected Lazio to adopt new tactic approach unknown to his side.
"It's also a problem because we don't know how Lazio will play in tactical terms," he added.