The Portuguese coach believes that figure will be enough to secure Champions League football next season.
"Most of the teams will have to get their act together, us exactly the same," Villas-Boas said. "It shifts very quickly for any team in the Premier League who does not get results. I think normally it's within the 70 to 72 margin. Seventy is normally enough to get in those four spots.
"The fact we have had these results recently has put people closer to us but we have been under pressure before and we built a gap which has been shortened now. We believe in our team and we haven't lost our confidence. We just have to make sure we get the minimum amount of points to be within that range of 70 points at the end of the season."