The 29-year-old has put pen to paper on a contract with the club that will run until 2022 and will wear the number five shirt.
It is the defender's second club in her career, making her debut with Birmingham at the age of 15 and spending a total of fifteen years with Blues.
'A very exciting challenge'
Speaking when the deal was announced, Harrop spoke of her excitement to play for Spurs:
“Coming to Spurs is a very exciting challenge for me and I know that the Club are heading in a positive direction.
“I want to continue to develop as a player under the management of Karen and Juan, and give my all to the Club both on and off the pitch.
"Having previously played in FA Cup finals and in the Champions League, I want to experience that again and I'm hopeful of doing that here at Spurs."
Career so far
With a total of 135 WSL appearances across her career, Harrop is one of the most experienced players in the division.
Most recently, she was captain of Birmingham City, who she departed at the end of the 2019/20 campaign.
Harrop was part of the Blues’ side who finished runners-up in the Barclays FA Women’s Super League (WSL) for two consecutive seasons in 2011 and then again in 2012, the same year in which they won the Women’s FA Cup.
She has represented the England national team at Under-19 level, winning the European Women’s Under-19 Championship in 2009, as well as at Under-23 level and was called up to the senior squad in 2013.