#1: Millwall must be proactive and decisive in January
The Lions have less than a month until the transfer window opens and plans have to be put in place now for what will be a crucial stage of the season.
Ian Holloway says he has too many players to select from and, within his bloated squad, 24 are coming to the end of their contracts.
If Millwall's current run of form continues and the second half of the campaign descends into a relegation dogfight, these players need to know where they stand.
It would be a huge risk to allow uncertainty to brew at a time when everyone needs to be in the same boat.
So that could mean moving players on in the New Year – not just making them available for transfer, but by proactively touting them around.
Holloway knows that he needs a smaller group to work with so trimming back the wage bill has to be a priority.
But in a market where clubs are looking to save money and reduce their squad sizes, selling players is becoming increasingly difficult.
That's why a lot of effort, focus and pre-planning has to go into this. Otherwise nothing will happen.
Holloway was able to move on Andy Keogh, Liam Trotter and Liam Feeney last January and he’ll need to make some equally important decisions next month.
#2: Missed opportunities in transfer market prove costly
Ricardo Fuller has never been a targetman – he's big and strong but wants the ball to feet. So that's why some weeks he looks suited to the battering-ram role and others he doesn’t.
In the second half against Bournemouth, Fuller caused mayhem with his physicality but Middlesbrough's centre backs marked him out of the game yesterday.
It's unfair to rely on Fuller to win every header because that's not his strength. His effort is unquestionable and he'll put himself about but nothing came off for him on Saturday.
And that only served to underline Millwall's failure to add another big striker to their squad both in the summer and before the loan deadline.
The Lions missed out on Matt Smith in August and he was still their number one target come the end of November.
As with getting players out, this is something Millwall must get right in January.
Holloway has discussed the possibility of looking overseas for new signings and a different approach is certainly needed.
#3: Lions falling between two stalls
Without an out-and-out target man – someone who can dominate opposition defenders in the air – Millwall will struggle to play direct, back-to-front football.
If they can't hold the ball up, it will come straight back at them.
But patient passing hasn't proved fruitful either – so the Lions are neither here nor there at the moment.
The Middlesbrough performance was powderpuff. There was no purpose or intent to Millwall’s play and too many balls were pumped forward aimlessly.
The Lions are lacking an identity at the moment. They need to settle on an approach, stick to it and recruit players appropriately.
A lack of wingers means Holloway is reluctant to play 4-4-2 but, as discussed above, Millwall don't have that lone focal point up front either.
The Lions are falling painfully between two stalls.
#4: Time to bring back Abdou?
Jimmy Abdou played a key role in Millwall's encouraging start to the season but has not featured since October.
The Lions were over-run in midfield yesterday and were crying out for someone with Abdou's legs to break up play and track runners.
Abdou's distribution and ball retention will never be the best but over 200 Lions appearances shows that he has the qualities to succeed at this club.
Last week he was dropped to the U21s but Holloway admitted after this mauling that he needs "players who know how to play for Millwall".
In a three-man midfield, there is definitely a space for someone with Abdou's attributes and he should be considered for a starting berth at Brighton.
#5: Gueye has done enough to earn a start
Magaye Gueye came on at half time and his performance was one of few positives to take from an otherwise bleak day.
Gueye, fresh from scoring the Lions' equaliser at Bournemouth, was sharp, quick, strong and confident. He had a swagger about him.
Were it not for a last-ditch block by a Boro defender, Gueye would have scored his second goal in as many appearances.
Holloway had been concerned about the Frenchman's fitness but says his efforts in training are improving all the time.
And with Gueye only under contract until the summer, the Lions are running out of time to get the best out of a player who clearly has talent.