Chelsea had a good spell at the start of the season, between October and December as Frank Lampard’s side went on a run of games playing brilliant football.

Chelsea’s bubbles have since burst and the Blues have been struggling for form since December.

Bayern Munich made matters worse as they outclassed Chelsea in the Champions League round of 16 clash at Stamford Bridge, beating the Blues 3-0.

Former Manchester United and Bayern Munich star Owen Hargreaves believes that Lampard must make up to four or five quality signings to strengthen the squad during the summer transfer window.

Hargreaves told BT Sport: “At least four or five [signings] – not just quantity but quality. ‘Real quality players who can make the difference. Every Bayern Munich player made a difference today at some point in the game.

“Frank had too many players who haven’t played enough football – whether it’s [Ross] Barkley or [Olivier] Giroud.”

Manchester United legend Rio Ferdinand also supported Hargreaves as he added: “He [Lampard] is going to have to implement his own philosophy.

“But he’s also going to have to dip into that transfer market and make some waves with the opportunity he has in the next window.

“Up front [is where he most needs to add] – Tammy Abraham does score but he’s young and needs someone to come and help with that responsibility.”