Manager Steven King believes the next three games will show whether Lewes are title contenders.
The Rooks lie fifth following a 2-1 win over Bishop's Stortford and now face a trip to Havant, plus home games against leaders Hornchurch and Weymouth.
King said: "The next three games will show us where we are. If we can come out of them with good results, then there is no reason why we can't reach at least the play-offs."
King admits Lewes were fortunate to get all three points against a battling Stortford side.
Lee Newman scored twice in the first half to put the Rooks in control at the break, before Warren Ryan hit back on 71 minutes.
King said: "We battered them in the first half and played some really good stuff but it was completely different after half time.
"They were the better side and they deserved something from the game."
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