The midfielder was heavily linked with a move away from Upton Park throughout the summer following the Hammers' relegation to the Championship, but his future was not resolved until deadline day.
It was Spurs who won the race for Parker's signature and he is now in line to make his debut in Saturday's game away to Wolves.
The 30-year-old admits the presence of Harry Redknapp in the White Hart Lane dugout made his decision easy, with the manager having made no secret of his admiration for the player.
"It was obviously a little bit difficult because I have left a very good club and one which I thoroughly enjoyed my time at, but when a club like Tottenham want to sign you it is pretty easy really and I am really looking forward to it," Parker said on Sky Sports News.
"I think it always helps when you feel the manager wants you, and over the last few years Harry has stated that he likes me as a player."
Parker was aware that other clubs were keen to bring him in, but says the opportunity to join Tottenham was just too good to resist.
Asked if there had been other offers, Parker replied: "Not really. There were obviously some different things that were happening.
"I think Tony Pulis and Neil Warnock have come out and said they wanted to sign me, but like I said, once I knew Spurs were interested it was the place I wanted to come."
Parker is also grateful to West Ham for allowing him to move back to the Premier League as he felt it was important for his England hopes to be playing top-flight football.
"Definitely I felt that at my age, at this stage in my career and how it's gone for me with England over the last year, that I needed to be playing in the Premier League," Parker explained.
"I stated that to the manager at West Ham and I appreciate that they have not made life hard for me and given me the move I wanted."