Shoreham Football Club have sealed a double swoop for Kieron Pamment and Joe Shelley from Southern Combination League Premier Division rivals Pagham.
The pair, both SCFL Premier Division title winners in the previous two seasons with Littlehampton and Horsham, have been with The Lions for the vast majority of this campaign.
With Mussels currently two points clear at the summit, the duo will be hoping to make it a third successive league title come April.
Shoreham boss Bryan O'Toole believes capturing the midfield pair will give his side an added winning edge ahead of a crucial run-in.
He said: "They are both proven players at this level and have won this division in the previous two seasons.
"Joe (Shelley) is a man mountain and will be massive for us in midfield. Kieron's one we could have potentially had earlier in the season but we're pleased to have him here now.
"We're a little light in midfield at the minute, so the addition of these two has come at a crucial time for us."
After falling to a 4-1 defeat at Hassocks on Tuesday - just their third league loss this season - Mussels make the trip to two-places and two-points below Chichester City tomorrow.
With Kevin Keehan, Rob O'Toole, Niall O'Hagan and Tom Burton all missing, both Pamment and Shelley are expected to go straight into the side for the crunch clash.
Bryan O'Toole added: "Without the addition of both Joe and Kieron, we'd have been really struggling for tomorrow. If you offered me a point now I'd take it.
"Our injury list is mounting up at the minute and we know how tough the game against Chichester is going to be."
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