The former Valencia man injured his hamstring against Manchester City, while the Belgian strained an abductor in training, but are expected back sooner than first feared
Former Valencia man Hernandez sustained a hamstring problem during the recent defeat to Manchester City on New Year's Day and was replaced by Lamah - who then, in turn, strained an abductor in training.
The Welsh club revealed on their website on Wednesday that both players are making good progress in their recovery and are closing in on a return to the first team.
Michel Vorm has been sidelined since the draw at Norwich City last month after undergoing knee surgery, which the goalkeeper revealed was a success but he remains uncertain of a return date.
"The operation went to plan," Vorm told Swansea's official website. "There was a little tear in my meniscus, which caused a lot of problems, but a small operation of around 30 minutes sorted things out.
"After a week of the operation, I feel much better than before. I can do almost everything already. My knee has a little bit of fluid in it, which is normal at this stage, but I'm very comfortable with my recovery.
"I feel better than how I did before the operation. We tried our best to contain it. I missed the Europa [League] game in Switzerland, and I trained fine after that.
"But during the warm-up of the Norwich game I could sense maybe something wasn't right. I'm the kind of player that will battle through it though, and I did for 90 minutes.
"After that game, my knee flared up so we knew we had to get it sorted."