"He's an experienced player and he will add more quality and increase our attacking options.
"However we know that he will be lacking in match-fitness because he has not taken part in Tottenham's pre-season matches.
"So the first thing we will do is assess him, and then we will take it from there."
Southgate added: "All the talks have been very positive and I don't see the medical being too much of a problem for him.
"We won't take the risk of putting him in too early considering his lack of football, but we are a little short on numbers at the moment and the sooner he is ready the better."