Sarginson was forced to stop Saturday's game on two separate occasions when Millwall supporters hurled objects onto the field.
Bottles and coins were aimed at one of the assistant referees after Scott McDonald was allowed to score a second-half goal from what appeared to be an offside position.
Play was stopped for more than two minutes as a line of police officers and stewards was moved to stand directly in front of the whole length of the Dockers Stand.
However, another bottle was thrown at Middlesbrough goalkeeper Jason Steele from the Cold Blow Lane stand behind the goal, and Sarginson took all 22 players to the side of the pitch as he contemplated abandoning the game entirely.
A discussion with Middlesbrough manager Tony Mowbray and Millwall boss Kenny Jackett resulted in play resuming, but Staffordshire-based Sarginson is sure to include details of the disturbances in the report he submits to the FA this morning.
As a result, the governing body will launch a formal investigation into the unsavoury scenes. Millwall avoided disciplinary action after investigations into two separate matches involving Leeds United and West Ham in 2009.
It was stupidity from their fans, said Middlesbrough defender Tony McMahon. There were bottles coming onto the pitch and there were coins being thrown left, right and centre. It's a shame to see really.
I know this is an intimidating place to come, and their fans get right behind them, but no one wants to see that. We made sure that we didn't get involved in that side of things, and I thought the referee handled things pretty well to be honest. I thought at one stage he was going to call it off, which would have been heartbreaking for us because we were winning.
Sarginson's threat to abandon the game came when Boro were defending a 2-1 advantage, but the relatively inexperienced official, who was only promoted to the Football League's national list in 2008, was persuaded to play on.
When he came over to the side of the pitch, he was taking the players off the field, said Mowbray. To be honest, I think he'd had enough. There'd been four or five bottles thrown from the stands. One almost hit our goalkeeper and I don't think he was willing to take any more, he thought enough was enough.
I just tried to convince him that we had to get the game finished. In hindsight that was the right decision, because there were no more incidents and nobody got hurt or injured.
The intensity and ferocity coming from the stands was unbelievable, and their supporters obviously get behind their team. But I thought we stood up to that really well and I thought everybody did well to get the game played and completed.
Jackett defended his side's supporters, despite a bottle landing within a yard of Steele as he lay in the goalmouth waiting to receive treatment.
I didn't think it would have been the right decision (to abandon the game), but told the referee to ask the Boro keeper, said the Millwall boss. We felt that things would settle down, which they did.
From our fans' point of view, there was some fantastic passion there and perhaps they felt aggrieved at one or two decisions which didn't go their way.
I'm not condoning it, but I do like the passion and enthusiasm. And some of the decisions we've had lately have been tough.
In the wake of Saturday's game, Middlesbrough's players had to wait in The New Den for more than half-an-hour as Millwall supporters were cleared from the car park to enable the team coach to park safely in front of the ground.
Source: Northern Echo
Source: Northern Echo