Former Arsenal midfielder Emmanuel Eboue is set to join Sunderland for the rest of the season.
The Ivory Coast international is set to help Sunderland avoid relegation, after he impressed Allardyce in training.
Eboue also impressed the youth coach in the match against Leicester.
“I was talking to him and he was saying that’s the first 90 minutes he’s had in more than a year,” Welsh is quoted as saying by the Mirror.
“He showed a good attitude and he looked better as the game wore on. He found his feet.
“He’s been good around the dressing room with the younger players, helping them, so I’ve got no complaints.”
After a midweek draw with Crystal Palace, the Black Cats lie 19th in the English top flight and are outside the relegation zone only on goal difference.