Celtic right-back Darnell Fisher has joined St Johnstone on loan for the rest of the season.

The 21-year-old saw summer signing Saidy Janko start in defence in place of the injured Mikael Lustig when Celtic made nine changes against Dundee United on Saturday, while Efe Ambrose is another option for the full-back spot.

The Reading-born defender will have to wait for his debut, though, as Saints take on Celtic at Parkhead on Saturday.

Fisher will also face competition at McDiarmid Park with Dave Mackay and Joe Shaughnessy both favouring the position.

Fisher has made 21 appearances for Celtic, including 11 starts, making his debut in October 2013.

Meanwhile, Rodney Sneijder has left Dundee United - weeks after signing a two-year contract at Tannadice.

United confirmed the Dutch midfielder's contract had been "terminated by mutual agreement" for health reasons.

Sneijder, the younger brother of Holland midfielder Wesley, made one appearance for the club, coming off the bench in their opening Ladbrokes Premiership defeat by Aberdeen on August 2.

Three days later he returned to Holland for tests on an illness and his departure has now been confirmed.

United manager Jackie McNamara said: "This is the best solution for Rodney first and foremost.

"We have a responsibility to protect the player's health moving forward and respect his current situation."

The club statement added: "Everyone at Dundee United wishes Rodney all the very best for the future.

"The club will replace any replica shirt which has been purchased from Dundee United Direct and customised with the player's name."

Sneijder could soon be followed out of Tannadice by Henri Anier, who has gone on trial with Polish side Wisla Krakow.

The Estonia striker joined United in January from German side Erzgebirge, but failed to replicate the form he showed at Motherwell and has not even made the United bench this season.