Sutton United boss Paul Doswell has described the moment striker Jessy Reindorf collapsed during a training session as “scary as hell”.

The Rwanda international was struck down on Tuesday afternoon at the club’s training centre in Guildford, in scenes that reminded Doswell of Frabrice Muamba’s collapse at Spurs in 2012.

However, after an ECG scan at Southampton General Hospital revealed no heart abnormalities, and Reindorf made a full recovery, the incident remains “unexplained”.

The striker may still play a role in Saturday’s Conference South visit of Hemel Hempstead – something Doswell thought impossible when the drama first unfolded.

He said: “We had a running session and Jessy complained of feeling unwell, so he sat out a second session.

Sutton United boss speaks from the heart on behalf of all non-League players

“Next thing we know, he’s collapsed. It was scary as hell.

“He was completely out of it and fitting a little. We screamed for help from the Harlequins medical team, who train nearby, and they gave Jessy oxygen.

“But they could not find a pulse on the wrist and we were all fearing the worst.”

He added: “The ambulance guys gave him an ECG and it showed a heart problem, but it was not conclusive.

“That really upset everyone and we were in shock, we were really shaken up. We could not carry on training, there was no way.”

He added: “Southampton’s specialist cardiology unit ran another thorough ECG and we are all delighted to hear it revealed no heart problems.”

“When he collapsed, all I could think of was the likes of Fabrice Muamba and Marc-Vivien Foe, it was that scary.”

Met Police striker Tobi Alabi collapsed on the pitch with a heart problem last year, and it ended his playing career aged 19.

It came 18 months after the high-profile case of Muamba, who collapsed due to a cardiac arrest while playing for Bolton Wanderers at Tottenham Hotspur.

Both Alabi and Muamba survived their ordeals, Cameroon international Foe collapsed while playing in the 2003 Fifa Confederations Cup, and later died.

However, Reindorf’s recovery has been so quick, he has already been on the phone to Doswell wanting to return to training.

Doswell said: “We have a duty of care to him, and we have to be sensible – he may be on the bench on Saturday, we’ll have to see."

The Harlequins man who came to Reindorf's aid in the vital first minutes was Andy Reynolds - Quins head of medical services.

He said: "One of the footballers from Sutton United required medical assistance, so I helped out as any medical professional would. 

“I’d like to wish him a speedy recovery .”