As predicted, Campbell was named in McClaren's mammoth 28-man squad for the friendly with Germany, where he will be joined by fellow Portsmouth veteran David James.
So, three months after his brave decision to recall David Beckham, McClaren has ushered two more of England's 2006 World Cup squad back into the fold, with Campbell set to start alongside Rio Ferdinand if John Terry's knee injury prevents him from playing.
"I know Sol won't let England down," McClaren told The FA's website.
"I always maintained I wasn't closing the door on Sol and I am very pleased to welcome him back into the squad.
"He has vast experience at international level and had a very strong season at Portsmouth last year."
Although the majority of McClaren's party, who are due to meet up on Monday, are familiar faces, new blood has been injected too in the form of Newcastle defender Steven Taylor.
Outstanding during the European Under-21 Championships in the summer, Taylor has maintained that form for the Magpies this term and with Ledley King, Jonathan Woodgate and Michael Dawson among those injured, the Greenwich-born youngster has edged out Joleon Lescott for the vacant defensive slot.
"Steven was with us for the B game against Albania at the end of last season and I was hugely impressed with his attitude and ability," said McClaren.
Taylor would not have been on his own in making the step up to senior ranks had Blackburn's David Bentley not blotted his copybook by withdrawing from under-21 duty so late that manager Stuart Pearce had no time to draft in a replacement for the European Championships earlier this summer.
Even before he made his decision, Bentley was warned of the likely consequences by McClaren, so it could have come as no surprise to the former Arsenal man that he had been left out of the Germany squad as punishment.
"I spoke to David and explained my decisions for leaving him out of the squad this time," said McClaren.
"This followed a conversation I had with him before he made his decision to withdraw from the European Under-21 Championships in Holland.
"I made it clear that I was disappointed with his decision not to travel to the tournament with his team-mates. That is why he was left out of the squad for the Germany game.
"As far as I am concerned, that is the end of the matter."
McClaren accepts he is likely to find himself with a number of non-starters over the weekend.
However, the England coach is eager to have all his senior players around for a planned debrief on Monday evening, which is almost as important to McClaren as the game itself given he can take the opportunity to emphasise the positive strides made during encouraging performances against Brazil and Estonia in June and get national team matters back on the agenda.
David Beckham, Owen Hargreaves and Michael Owen are among those McClaren wants to see, as is Liverpool skipper Steven Gerrard, whose fitness will be assessed by England's medical staff before a decision is taken on his availability.