Sherratt is due to return to Cardiff after being aided by a temporary backroom staff in Japan which also includes Gethin Jenkins, Danny Wilson, Adam Jones, Rhys Thomas and Leigh Halfpenny.
Most are in line to return to their clubs now but not before Lake thanked them for their efforts.
"They have built that confidence over the last five weeks and allowed us to express ourselves on the field," said Lake.
"That's been a massive help."
Sherratt gave one final message to the fans who have followed Wales through the trials and tribulations of the past two years.
"Thanks so much for your support," said Sherratt.
"Even during the Six Nations, I know it's been a hard time to support Wales.
"I hope you can enjoy tonight because we are certainly going to enjoy the next 24 hours."
Then off Sherratt and Lake disappeared to join in with that victory song. It has been a while since we could say that. 644 days to be precise.
The win should not paper over the cracks of Welsh rugby's problems and was achieved against Eddie Jones' Japan side who are now ranked 14th in the world with Wales returning to 12th.
A summer of upheaval still lies ahead off the the field with major changes in the Welsh game being discussed.
However, just for today, this long-awaited triumph needs to be recognised, for the long-suffering players, coaches and fans.
It is just a small success, yes, but hopefully a significant one.
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