Evans, who was part of a three-man central defence against Poland, said manager Michael O'Neill was looking at a different approach against Ukraine in Lyon.
"Michael has hinted that we might try different things against different teams, especially Ukraine who are very good from the wide areas," the 28-year-old told British media.
"I think we'll learn from (the Poland game) the fact that maybe at times we need to try to play a bit more.
"(Andriy) Yarmolenko is probably their most dangerous player."
Northern Ireland finish the group stage on June 21 against world champions Germany, who top the section after starting with a 2-0 win over Ukraine.
(Reporting by Nivedita Shankar in Bengaluru; Editing byb Ken Ferris)
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