The veteran scrum-half also revealed he will have to wear a heart monitor for at least three years after undergoing minor cardiac surgery in the summer but is raring to go and put things right in the Midlands.
Tigers finished eighth in the Premiership just two years after winning the title, and one after making the semi-finals, and McKellar left the club.
Youngs was in France with England at the World Cup as Leicester lost three out of their first four league games and never got any real momentum.
The 34-year-old is now off the international scene and reckons the new regime, headed by Michael Cheika, can get the club off to a flyer but it is down to the squad to deliver.
Youngs said: “There were a lot of guys away at the World Cup, so when they came back, some of the damage was already done. You are chasing your tail in a league where there isn’t that many games you can afford to lose.
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