Latics play Bolton on Saturday at the DW Stadium, with new England international Davies likely to be the main threat for the hosts.
Following his strong performance against Newcastle last weekend, Martinez is very confident that Alcaraz will have no problems with the physicality of the veteran striker.
"Antolin, in a way, has had a taste of that already after what happened at Newcastle (last weekend)," Martinez said.
"He was up against two very physical players in Andy Carroll and Shola Ameobi, and until you get out there on the pitch you can't really prepare yourself for games like that.
"Kevin Davies is another one of those players, and his threat is probably one of the biggest assets that Bolton have at the moment. But I'm sure Antolin will be able to look after himself."