Viv Anderson, 62, and Mikael Silvestre, 41, were spotted making their way into Carrington ahead of Sunday's showdown with Liverpool.
Solskjaer's side, who have been working closely with former manager Sir Alex Ferguson, have conceded 35 goals in 26 league games this season.
In a bid to strengthen his defence, the interim boss could have called the pair back to training to share their knowledge.
Anderson was the first player that Fergie signed in 1987 and he stayed with the Reds until 1991.
Silvestre, who is a club ambassador, won the Premier League four times during his nine-year spell in Manchester.
Paul Pogba managed to distract some attention away from Anderson and Silva when he rocked up to Carrington.
The French World Cup winner turned heads as he cruised into the training ground in a bright yellow Ferrari.
Sergio Romero gave a cheeky thumbs up to the camera as Giuseppe Rossi rocked up in the back of a taxi.
Since he took over in December, Solskjaer's side have lost just once in 13 matches.
The Norwegian boss, who is looking to secure the job permanently, has been mimicking the attacking approach used by Fergie.
He has even asked his players not to call him boss – just like everyone did with Sir Alex.
And SunSport exclusively revealed that Solskjaer reintroduced Fergie's famous quiz nights on team stopovers.
The legendary Scotsman, 77, was spotted making his way into the training ground last month.
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