Everton travelled to Dubai on Sunday, as Martinez used the time away from competitive action to allow his team to train in a warmer climate.
And the Spanish boss insists that the Toffees will return an improved side, with Niasse - a January signing from Lokomotiv Moscow - set to gain a lot from the time away with his new teammates.
"A new face in the group, spending time with all the players, is invaluable," the Spanish boss said. "As a footballer, you get more understanding when you interact. You get to know each other and become good friends, so Oumar is going to benefit more than anyone
“The opportunity of working with players constantly for a period of six or seven days, especially for the players who are coming back from injury who need a bit of extra work, is very important.
“Other players will need an individual programme, so it’s the perfect opportunity to do all those things with a bit of warm weather training.”
Niasse made his Everton debut against Bournemouth on Saturday.
The Toffees won the FA Cup tie 2-0, with Niasse coming on as a late substitute at Dean Court.
That result was Everton’s fourth win in five matches, with the Merseyside club putting together a strong run of form.
Everton have now been on mid-season training camps abroad in each of the last three seasons.
Sunderland are also out in Dubai at this moment in time, with a lot of teams having time off from their gruelling schedules.
The Toffees return from the Middle East at the weekend, before they face Aston Villa next Tuesday.