The Manchester United forward was left out of the latest England squad.
Marcus Rashford, who has not scored a goal since January 22, has been left out of the upcoming games with Switzerland and the Isreal.
I think it is important for me to go and sit with him and find out more about what is going on.
He is desperate to do well.
In 26 appearances this season, Marcus Rashford has scored five goals.
A video on social media appeared to show the player responding angrily to fans after the home defeat to Atleti Madrid.
He denied making a rude gesture to fans.
I think Marcus is realistic.
He knows he is in a situation where he has not been getting in the United team consistently and he will be searching as much as anyone to get that form back.
The England manager is convinced that the 19-year-old will return to the form that saw him make his England debut at the age of 18.
He can be an asset to his club and his country.
One or two of our players in the past have had dips and come through them, and they responded well and became stronger.
He will have to prove that in the coming weeks and months. His rise from when he first broke into the team at United was incredible, even though nobody's career goes smoothly from start to finish.
Speaking to Radio 5 Live, Southgate said the onus was on Rashford to get back on track.
He said that many players have spells in their career where they are flowing and things are going well.
You have other spells where that isn't the case. You need to find a way back.
I think he is in a spell where he is not starting regularly for Manchester United and he has suffered a bit with his form.
I think we can talk with him about that, and Manchester United will do that as well.
The season has been difficult for him. He had a broken pre-season, which is not helpful for a player. He can get back on the training pitch and get himself up to speed.
He has the ability to get back on track.