By the end of the day, both Dodi Lukebakio and Didier Ndong should be through the door and ready to turn out for Watford for the rest of the season.

Lukebakio has been given a squad number, taking the vacant 20 unoccupied since Mauro Zarate left on one of his many loan spells.

But he could still return to Belgium for the rest of the campaign, as he is only recently 20 years old himself, and the demands of the Premier League could come too soon for him just now.

Ndong will act as competition for places in midfield, and is the first real defensive midfielder the Hornets have had since Valon Behrami left the club in the summer.

We asked two people who know the duo a lot better than we do for their opinions on them.

Maxime Jacques, journalist for Belgian daily newspaper La Dernière Heure:

"Dodi is a very technical player, a good finisher and a good dribbler. He made an impressive start this season, showing great mentality and confidence.

"But then, his consistency fell away. He has never been used to having to defend and it was quite a problem in Charleroi because the coach, Felice Mazzu (who was awarded best coach in Belgium in December) asks for a lot of defensive work from all his attackers. They hade problems together.

"Dodi was left in the stand twice because of a of lack of commitment defensively, and his recent games have been very disappointing. So the club decided to pay the option of €1.5 million to Anderlecht in order to sell him on to Watford for an immediate profit."

Stephen Goldsmith, presenter at 103.4 Sun FM and host of the Wise Men Say podcast:

"Didier has been a frustrating player for Sunderland. All the potential seems to be there, he can pass the ball, get around the pitch and carry the ball well. Yet he doesn't show anywhere near enough of it.

"He gets nervous in possession when the pressure is on and allows himself to eased off the ball. If he was a youth product who had broke into the first team then fans would want him to stay and would generally think he had a big future.

"However, he cost £13m and has never looked like remotely justifying that price tag. He'll always be remembered as the signing Moyes made when we could have brought Yan M'Villa for half the price.

"Surrounded by better players, he'll probably slot in okay and get the ball from A to B. He's not been the type to go an take a game by the scruff of the neck though, even at Championship level - which has been highly frustrating."