The Cameroon international has featured just three times this season and last played in Spurs' 1-1 draw with Norwich on September 1.
Andre Villas-Boas had initially expected to lose the left-back for four weeks, with right-back Kyle Naughton and central defender Jan Vertonghen filling in for Assou-Ekotto during his absence.
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The former Lens defender joked he had spent so much time away from the squad, he may have forgotten who some of his team-mates were.
He tweeted: "Trainning with the team today !!! I hope as i ll remember the name of every one LOL."
Assou-Ekotto, who featured 40 times in all competitions last season, has a goal to his name already this term after netting against West Brom in August.