City have been without their captain since January while the Argentine striker has struggled with a knee injury, but the Italian says they will be back for the Newcastle clash
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Aguero has been in Argentina undergoing treatment on a knee injury, and has not featured since February 24. His national side had hoped he could play in their upcoming World Cup Qualifying games against Venezuela and Bolivia, but Mancini has revealed that he will return to Manchester.
"Sergio is in Argentina but he will come back on Sunday," Mancini told reporters.
"Vincent is not in our plans for [Saturday]. But I think he will be ready for the Newcastle game, like Sergio.
"It is difficult. Vincent is a really important player for us and now it is 45 days he has been out. It is a big problem."
The Premier League champions face a tough trip to Goodison Park to face Everton, who Mancini says play at "200 per cent" at all times.
"Every game against Everton is very hard," Mancini added. "They are a top team who always play at 200%. They have good players and a good manager."