But the former Gillingham youngster emphasised that his move to Southampton has been a huge success story on a personal level.
“For me it wasn’t a case of ‘my career isn’t going right, I’m not playing for Chelsea’,” Bertrand said ahead of England's match with Republic of Ireland. “I know personally I should still be there and I should still be playing [for them].
“I know that in myself. That’s my inner confidence. It’s nothing to do with my capabilities that I’m not there, it’s purely circumstance but it is no drama. That is football and these things happen. I’m not trying to prove people wrong and I’ve no grudges, no chip on my shoulder. Football is football, business is business.
“I am fantastically happy at Southampton now, playing week in, week out, developing as a footballer and really enjoying life.
“I felt I’d made progress this last season, that I’d got to know myself more as a player. Things come more naturally when you’re not in-out, in-out."
Like so many young English players, the 25-year-old struggled to break into Chelsea's expensively assembled squad despite his obvious talent.
And that is despite Bertrand doing better than most, playing significant roles in the 2011-12 and 2012-13 seasons.
However, in the first half of the season when Jose Mourinho returned to Stamford Bridge, he played just three times, and went out on loan to Aston Villa in January last year.
With the many millions available over the last ten years, more often than not it has been multi-million pound signings that are first team regulars since Roman Abramovich took over.
But Bertrand proved his qualities for the Blues, enough to possibly feel hard done by being deemed expendable by Mourinho, with his Champions League final contribution a particular highlight.
The fullback has undoubtedly flourished since leaving this season's Premier League champions though, breaking back into the England squad and winning a spot in the Premier League team of the year while at the Saints.
So it's no surprise to see him happy to be at St Mary's - it'll be interesting to know if Mourinho is wishing he would have kept the defender.