Everton and Bournemouth played out a 3-3 draw on Saturday.
Everton twice were in commanding positions at Dean Court on Saturday, but they slipped up.
The Toffees conceded a 98th minute equaliser, with the match finishing as a 3-3 draw, but Martinez was keen for his young squad to learn from the experience.
“You need to be focused,” Lukaku said. “The referee didn’t blow the whistle, so you need to be focused until the last second of the game. We weren’t, they scored the goal and everybody is down.
“But like the manager said after the game, we need to learn from this.
“As long as the referee didn’t blow the whistle, we needed to stayed focused and try to defend the result.”
As the scoreline suggests, Everton’s match against Bournemouth was an absolutely pulsating encounter.
The Toffees raced into a 2-0 lead, thanks to goals from Ramiro Funes Mori and Romelu Lukaku.
However, Eddie Howe’s men put in an excellent second half display – and they managed to fight their way back level in the fixture.
Ross Barkley had then looked to have won it for the visitors, when he scrambled the ball into the net in the 95th minute, but Bournemouth struck back once again through Junior Stanislas to ensure that the points were shared.
It was a stunning comeback, but one which would have left Everton feeling deflated a full-time.
A win on the south coast would have pushed Everton into sixth place in the Premier League table, but they currently sit in ninth position after failing to hold on.