Turner is out for an "indefinite period" due to an issue with her neck arteries.
Turner was left out of the squad for the match against Spurs.
She had a problem in her neck.
A club statement read: "Manchester United can confirm that Millie Turner will be unavailable for today's game and for an indefinite period, after recent medical investigations revealed an issue with the artery in her neck."
Millie will continue to work closely with the club's medical team and specialists, which will involve modified training and reassessments in the coming weeks and months.
"Everyone at the club is praying for her quick recovery."
In February, Sky Sports will show the game between Man Utd and Arsenal.
Sky Sports will show a live match between last season's WSL champion, Chelsea, and league leaders, Arsenal, in February.
The WSL table-toppers, who suffered their first defeat of the season against bottom-side Birmingham earlier this month, will host Manchester United on February 5.
The table has WSL news.
Sky Sports has live football.
The game between the two teams will be played on Friday February 11 at 7.45pm.
Next month's London derby is shaping up to be a genuine six-pointer in the race for the title, with both teams having a game in hand.
Both games will be shown on Sky Sports, with free match highlights available across Sky Sports' digital platforms.
The December WSL awards were won by Skinner and Toone.
Man Utd'sMarc Skinner andElla Toone were rewarded for their performance in December.
The Manchester United manager and forward won the December Manager and Player of the month awards.
In December, Skinner oversaw two wins, one of which was a demolition of Villa.
Skinner joined United in the summer from the US side of the same name.
In December, Toone was the Player of the month and he played 90 minutes in the win at Brighton and scored twice.
In 11 games this season, the 22-year-old forward has five goals and five assists, helping United to third place in the WSL.
After making her debut last year, Toone found the net on a regular basis for England, with six goals in just eight games.