The footballer went down off the ball during second-half stoppage time of the clash against Chelsea.

Arsenal's players and their manager Jonas Eidevall quickly signalled for medical staff when they saw the Norwegian international hit the ground, with fellow Gunners, Stina Blackstenius and Katie McCabe rushing to her.

Both sets of players remained on the pitch while Maanum received oxygen through a mask before being carried down the tunnel at Molineux.

Since then, Maanum has been in a stable condition.

A statement on the club website read: "Following the incident during the League Cup final on Sunday, which resulted in Maanum being substituted at the end of normal time, she has undergone extensive testing and support from our medical team at Arsenal.

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"The test results have been reviewed by two leading cardiologists and there are no obvious cardiac causes found from these thorough investigations so far.

"Frida has subsequently had a monitoring device fitted to record her heart function and will now undergo a progressive return to training protocol.

"Once Frida has been monitored for a full one-week period, her normal training will be closely reviewed and monitored, before a decision will be made on her returning to play."

Arsenal said the Norwegian would not be joining her national side ahead of their European Championship Qualifier with Finland on Friday.