Moss works in training on a daily basis with Jalal and said he felt the Cherries stopper's form had suffered as a result of a persistent back injury.
His dip coincided with a seven-match winless run the club's longest in the same season since 2006-07 as Cherries' promotion push began to falter.
Off-field issues surrounding Jon Stewart compounded the situation, although Jalal eventually came out of the firing line for the 2-2 draw with Charlton after having an injection.
Jalal, who starred during Cherries' promotion last season, helped Lee Bradbury's men get back on track by keeping a clean sheet at Notts County on Saturday.
Moss told the Daily Echo: He has had another good season. He has struggled with a couple of injures, which he didn't have last year, particularly his back. But he had to play through it a lot more than maybe would have been ideal because of the circumstances with other keepers.
He should really have had the jab maybe six weeks earlier but, even though he was probably advised to, he wanted to carry on and do his bit. That coincided with probably his shakiest patch for two years. I know he didn't want to make anything of it but, working with him in training and watching him in games, you could see he was only 70 to 75 per cent.
You can see the sharpness is back now and it was fantastic for him to keep a clean sheet against Notts County.
Moss is tipping Jalal to keep producing the goods as Cherries look to cement a place in the League One play-offs in the final four games of the season.
He is quite a laid-back sort of guy and goes into games quite relaxed, added Moss. I don't envisage anything different from him for the last four games.
A lot does rest on his shoulders and he is an important part of the team. Without him, we wouldn't be in the top six so he can hold his head high and go into the games with a lot of confidence. Hopefully, he can keep making the saves and the team can keep scoring the goals that take us into play-offs.
I have been involved, both watching and playing, for more than 30 years and, if we were to get a second promotion, I don't think it would be stretching it too far to say it would probably be the best achievement in the club's history.