Super Eagles coach, Gernot Rohr will use the two international friendlies against Poland and Serbia to try out new formations with his team ahead of the 2018 FIFA World Cup.
The Eagles face Poland on March 23 and four days later, they tackle Serbia in London.
"I hope to try different systems (in these matches), so we can change when necessary," Rohr said.
"We have played 4-3-3, 5-3-2 already.
"We also hope to improve team harmony after did well in last two games, while playing offensive football."
Rohr has also disclosed he will give fresh call-ups Joel Obi (Torino), Junior Ajayi (Al Ahly) and Gabriel Okechukwu (Akwa United) a chance to stake a claim for places on the World Cup-bound squad.