Having been promoted to the position of club captain last summer, it was anticipated that Dawson would be one of the first names on the teamsheet this term. But, to the shock of many Spurs fans, Villas-Boas allowed the centre-back to speak to QPR after accepting a £9million bid for the player in August.
Dawson turned down the chance to move to the west London club in order to fight for a place in Villas-Boas' starting XI, but the Portuguese overlooked the England defender for the opening third of the campaign.
The 29-year-old has since worked his way back in to the Villas-Boas' XI, however, starting the club's last seven Barclays Premier League games.
When asked whether he thought it was a mistake to let the former Nottingham Forest man speak to QPR, Villas-Boas said: "Yes. I think we appreciate the fact we were able to hang on to him.
"We ended up being on the better side by the fact he agreed to stay with us. We were lucky in that sense."
Although Villas-Boas would probably not consider selling Dawson now, he will have to cut one of his centre-backs loose this summer.
With Jan Vertonghen and Younes Kaboul both in their prime, and Steven Caulker considered a bright young prospect, it appears 35-year-old William Gallas - who is out of contract in June - is the most likely to depart.
"We won't start another season with five centre-backs," Villas-Boas said.
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