Arsenal striker Robin van Persie has suggested the club could fall behind the rest of the Premier League's top teams unless they make major signings this summer.
So far Arsenal have signed only two players, with Carl Jenkinson arriving from Charlton Athletic and Gervinho due to complete the formalities of his move from Lille for around £10.5 million later this week.
With Gael Clichy sold to Manchester City and doubts remaining over the futures of key midfield creators Cesc Fabregas and Samir Nasri, Van Persie has called on manager Arsene Wenger to make a statement of intent in the transfer market.
"The way I feel now is that a few signings are more than welcome," Van Persie was quoted as saying in the Daily Mail. "Every other team is buying quality players, so hopefully we will do the same.
"You need investment to keep up. When you look around, you see Manchester City are buying loads of good players, Liverpool are doing it now and Manchester United have been doing it for years.
"In a way, you need to keep that up because if everyone is doing something you need to do it as well. I think it's a good thing that we have competition because no one really wants to go to sleep.
"In an ideal world, no one (should be) really sure of his place (in the team). Maybe the captain and the goalkeeper but all the other players shouldn't really know before that they will play. It's always good to have competition and be on your toes.
"These days, proper players cost money. Sometimes you see players go for loads of money and you think, 'Is he that good?' They are, most of the time, but sometimes there can be a statement for the others as well.
"The main thing is, it is not just a label, a multi-million pound signing. It's about the quality. If you buy a player who has got one year left, normally he's not going to be worth 40 or 50 million, he'll be a bit less."
Van Persie said of Fabregas' mooted sale to Barcelona: "He sees things quicker than others. He'd be a miss for any team."