U.S. stock index futures indicated a slightly lower open on Monday, after five straight weeks of gains, as investors focused on the price of oil and monitored comments by Federal Reserve members.

U.S. crude oil futures for April delivery reversed losses to attempt gains, trading near $39.60 a barrel as of 8:44 a.m. ET. After the settle, the contract rolls to May, which was near $41.30 a barrel in morning trade.