Sturridge scored at the weekend, but he seemed to lack fitness.
Sturridge scored the second of the Reds' goals - making it seven for the season for him in all competitions - but seemed to tire late on before he was substituted for Christian Benteke.
Aldridge wrote in his Liverpool Echo column: "Daniel Sturridge’s quality was there for all to see at St Mary’s with a very good goal.
"But I do think we also saw that he’s still scared to go full blast with his body.
"When he’s on the pitch you can see what he can do but the manager demands the work rate of players from the 60s, 70s and 80s, that you chase everything and that’s not something that Daniel Sturridge does and it’s not something that Christian Benteke does. He has got to get them into his way of thinking.
"Daniel looks like he is worried about something going twang but hopefully he will grow more confident as he gets more games under his belt which is what you’d normally expect to happen."
It would be of little surprise if it were the case that Sturridge is afraid of breaking down again given his injury record in recent years, but one should point out that it could be a simple case of him trying to get back to fitness, and there are going to be times when he is tiring.
There is little doubt about the quality Sturridge possesses as the Reds certainly carry a more potent attacking threat whenever he is available, but it's probably a little early to expect him to be 100% fit and running around for 90 minutes as his maximum given injuries in the recent past.