Chelsea midfielder Nemanja Matic says teams who spend big in the transfer market will inevitably run into trouble finding stability, following Manchester United's recent spending spree.
After finishing fourth last season, United have acted decisively in their attempts to address the gap between themselves and those who finished above them in the Premier League.
Following Memphis Depay's arrival at Old Trafford in June, midfielders Morgan Schneiderlin and Bastian Schweinsteiger have been added to Louis van Gaal's new look midfield, while Italy international Matteo Darmian has come in to provide cover at right-back.
United are expected to make further additions with a "surprise striker" wanted by Louis van Gaal, according to the Daily Mail, while Real Madrid centre-half Sergio Ramos also remains linked with the club.
But Matic has warned such upheaval does not always have the desired effect.
He told the print edition of The Sun: "Maybe teams that sign lots of players will end up finding it worse. It is sometimes better to stay with the same team, for stability."
In addition to United, Manchester City have strengthened with the additions of England duo Raheem Sterling and Fabian Delph, while Arsenal have been reinforced by the arrival of former Blues stalwart Petr Cech.
Matic is anticipating a tougher challenge from the sides who finished behind Chelsea and appreciates there is still lots of work to be done at Stamford Bridge.
"It's going to be more difficult because, when you are champions, everyone wants to beat you. But we will be ready, we know what we have got to do. We've got to win 95% of our games
"When you are a team of champions, you are ready for everything and our squad is strong enough. If quality new players come in, they are always welcome. There is always space for quality players. It doesn't matter what happens in the transfer market, we are ready."