Millwall suffered their second successive defeat after losing 1-0 to Brentford.

Romaine Sawyers’ 47th-minute goal was the difference in a tight affair.

Lions striker Lee Gregory missed a penalty late on as his side wasted opportunities to equalise.

Here are five things we learned…

Millwall must be more ruthless

Not for the first time this season, Millwall will be wondering how they’ve managed to leave empty handed. The Lions mustered up 19 shots, with six on target, with most of them falling the way of Gregory.

His first chance came midway through the first-half and somehow managed to miss the target when given the freedom of Griffin Park. Millwall’s best opportunity came eight minutes from time, but Gregory failed to claim his third goal of the season when his penalty was saved by Daniel Bentley. Aiden O’Brien also missed a golden chance when he volleyed over from close-range.

Decisions did not go the Lions way

Firstly, Millwall were denied what looked like a clear-cut penalty just after half-time when Shaun Hutchinson appeared to be clipped just inside the box, but referee Lee Probert disagreed and waved play on.

Then, on 82 minutes, the game’s controversial moment. Jed Wallace broke into the Brentford box and seconds after he was fouled, Gregory had the ball in the back of the net, but Probert had already awarded Millwall a penalty.

Once Gregory dusted himself off and took the spot-kick, it was saved. Neil Harris also stated in his post-match interview that Millwall could have been given another penalty, as a Brentford defender clearly punched the ball away from danger from a Lions corner.

Goals and points continue to be hard to come by away from home

Only Bolton and Burton Albion (1) have scored less Championship away goals this season than Millwall (2) and that is the obvious reason why the Lions have only accumulated three points away from the Den this term.

The frustrating thing for Millwall is the fact that they have only conceded five goals on the road, the joint-best in the Division.

Wallace a bright spark on a frustrating day

The summer signing from Wolves has possibly been Millwall’s most consistent player this term and put in another eye-catching display, as he did in the Lions last London Derby at Queens Park Rangers last month.

Wallace looked Millwall’s most dangerous player against Brentford and came close to scoring on several occasions and won the late penalty.

He was denied twice in the first-half by Bentley and then for a third time when his thunderous strike from the edge of the box was superbly tipped over.

Injuries proving costly

Three crucial injuries in three weeks and it showed for Millwall at Griffin Park.

Jake Cooper came in for Byron Webster and did himself justice by producing a solid display in the heart of the Lions defence.

But it was Shaun Williams and Steve Morison’s presence that were missed most. Millwall will have to get used to playing without Morison, though, as Harris stated post-match that the 34-year-old will be out for the “foreseeable future” and most certainly out of next week’s game when Birmingham visit the Den.