The Portugal international, who re-signed for the club from Juventus in the final stages of the summer transfer window, has been training alongside his new teammates this week.
Solskjaer, during Friday's pre-match press conference, said that the 36-year-old would be on the field at some stage of the clash with the Magpies but refused to guarantee that the attacker would start.
"He's had a good week with us here. He'll definitely be on the pitch at some point, that's for sure," Manchester Evening News journalist Samuel Luckhurst quotes the Man United boss as saying.
"Everyone is very happy to have him back, the mood has been very good. We are looking forward to Saturday of course," Solskjaer added when questioned on the Portuguese.
Ronaldo scored 118 goals in 292 appearances during his first spell at Old Trafford between 2003 and 2009 and has since turned out for both Real Madrid and Juventus.
Monaco 
Stade Brestois 29 
Bordeaux 
Nimes 
Bayern Munich 
FC Augsburg 
Paris Saint Germain 
Toulouse 
CSKA Moscow 
FC Rostov 
Leicester 
Chelsea 
Valencia 
Betis 
Dynamo Kyiv 
Chornomorets Odesa 
Verona 
Inter 
Bayer Leverkusen 
FC Heidenheim 
Borussia Dortmund 
SC Freiburg 
VFL Wolfsburg 
Union Berlin 
Arsenal 
Nottingham Forest 
Everton 
Brentford 
Spartak Moscow 
Lokomotiv Moscow 
Rangers 
Dundee Utd 
Atletico Madrid 
Alaves 
Lens 
Marseille 
Ingulets Petrove 
Shakhtar Donetsk 
AC Milan 
Juventus 
ST Malo 
Manchester City 
Tottenham 
Eintracht Frankfurt 
Werder Bremen 
Girona 
Espanyol 
Feyenoord 
Heerenveen 
ST Etienne 
Montpellier 
Grenoble Foot 38 
Heart Of Midlothian 
Celtic 
Reims 
Lyon 
PSV 
Groningen