After an opening-day draw at Newcastle and a hard-fought home win over Udinese in their Champions League play-off and with injuries mounting ahead of a crunch period that involves games against Liverpool and Manchester United, Walcott has joined the calls for new recruits.
"This team has always been known for being young. But we can't use that as an excuse any more. We have to win something this season," he told a number of national newspapers, relating to the club's six-year trophy drought.
"It is important to have a mixture of experience and young players - but the boss knows what he is doing. He has picked up great players before. Only time will tell what he is going to do.
"Of course the players sometimes think, 'What's going on?' We've had a couple of injuries and we have to hope they are not too bad. We have got a fairly big squad but we don't want the squad to get lower and lower.
"The boss knows what he is doing and hopefully those players will be fit and ready to go anyway.
"I'm sure the boss has got players coming in. I don't know, but if you sell one of your best players... I'm sure he's got some options coming in."