Joe Root's tactics against West Indies "fell a long way short", according to Michael Vaughan, who warned England "may go further backwards" before going forwards.
England were held to consecutive draws across Tests in Antigua and Barbados before faltering in the winner-takes-all decider in Grenada.
Root's tourists recovered from 90-8 to 204 in the first innings, but were never ahead in the game as Kraigg Braithwaite's side mustered 297 before again bowling England out for just 120.
That left Brathwaite and opening partner John Campbell to secure a 10-wicket victory as they required just 4.5 overs to chase down 28 on Sunday, condemning England to a fourth consecutive series defeat.
England have won just one of their last 17 Tests and are winless in their last nine red-ball outings, their longest such streak in the format since a run of 10 between August 2013 and July 2014.
Questions over Root's captaincy remain prominent with the ECB searching for a new managing director and coach, and Vaughan believes his fellow Yorkshireman needs to take some time to consider his future.
"Let Joe Root sleep on it for a week or so," Vaughan said to BT Sport of Root's future at the helm.
"I fear this red-ball team might go further backwards before it goes forward and you're going to have to have a lot of energy as a leader, a captain you're going to have to have a huge amount of energy to wake up every morning to captain this side.
"Generally in English conditions, the Test match team win lots of games, win lots of series – well last summer they lost to New Zealand and they were losing to India, so I don't see this Test match side suddenly becoming a team that consistently wins series after series and that's in English conditions.
"So Joe is going to have to find a huge amount of energy and he's also going to have to improve, because tactically in this game he was a long way short. The England side fell a long way short.
"I don't see too many players, out of this England Test team, who can suddenly come in and spark England into getting 450 consistently against the better opposition, when the ball is moving about.
"That's why I do think there could be some darker days ahead and it's going to take a leader with a lot of energy to try and get this Test match team right."
Paul Collingwood took temporary charge for the series in the Caribbean after Chris Silverwood was dismissed following Ashes disappointment, but the identity of England's next permanent coach remains unclear.
Vaughan would like to see England appoint former Australian coach Justin Langer, who guided his country to T20 World Cup success at the end of last year before lifting the Ashes.
"I would personally go for Justin Langer – he's the sort of leader that England need at the moment," he added.
"Then it is a conversation with Joe Root to see if he's still got the energy to take England forward and even then I'd debate it.
"You could give it to Ben Stokes to the end of next year's Ashes and then hope that a younger player like Zak Crawley is ready."
Matthews takes 2-21, hits 41 as Melbourne Renegades get first win of the season in WBBL
West Indies captain Hayley Matthews produced a strong all-round performance to help the Melbourne Renegades get their first win of the season on the Women’s Big Bash League in Australia, a six-wicket win over the Perth Scorchers at the Junction Oval in Melbourne on Saturday.
The Scorchers were bowled out for 140 in 19.4 overs after winning the toss and batting first.
Opener Beth Mooney led the way with 36 while Alana King (26) and captain Sophie Devine (22) also made valuable contributions.
Sophie Molineux was the outstanding bowler on the day for the Renegades with 4-17 from her four overs and was well supported by Alice Capsey (2-15 from three overs), Matthews (2-21 from 2.4 overs) and Georgia Wareham (2-35 from four overs).
The Renegades then needed just 17.4 overs to reach 145-4 and secure their first win in three tries this season.
A 102-run opening partnership between Matthews and Courtney Webb set up the chase beautifully.
Webb led the way with 61 off 40 balls including nine fours and a six while Matthews made 41 off 27 balls including seven fours and a six.
Deandra Dottin hit a six to seal the win off Alana King who took 2-35 from 3.4 overs.
Jadeja and Ashwin boost India hopes of avoiding series whitewash
India boosted their hopes of avoiding a series whitewash by taking control on day two of the third Test against New Zealand in Mumbai.
Ravindra Jadeja (4-52) and Ravichandran Ashwin (3-63) led the hosts' charge, as they reduced the tourists to 171-9 at the close.
Following their late 10-minute collapse on Friday, which left them at 84-4, Rishabh Pant (60 off 59 balls) and Shubnam Gill (90 from 146 deliveries) ensured India made a progressive start to the second day.
Washington Sundar also chipped in with 38 from 36 balls, but Jadeja and Sarfaraz Khan went in quick succession as New Zealand claimed three wickets in the space of 10 overs after lunch.
The Black Caps trailed by 28 after bowling their opponents out for 263, but lost Tom Latham in the opening over, with Devon Conway and Rachin Ravindra following soon after to leave them at 44-3.
Will Young (51 off 100) chalked up his second 50 of the Test, though it proved a false down for the tourists, as Jadeja and Ashwin took a combined seven wickets to keep their side's deficit down to just 143 with one wicket remaining.
Data Debrief:
India are desperately trying to prevent New Zealand from inflicting their first-ever home whitewash in a series of three or more Tests.
Pant certainly did his bit by taking just 36 balls to notch up India's fastest Test 50 against the Black Caps, for whom Patel (5-103) took his second five-wicket haul in the city of his birth, as well as his sixth overall in Test cricket.
Jadeja was also inspired in the field, though, as he took his wicket tally for the Test to nine.
Webster hits 95* as defending champions Red Force move to two wins from two with seven-wicket victory over Volcanoes at Brian Lara Cricket Academy
Hosts and defending champions Trinidad & Tobago Red Force comfortably defeated the Windward Islands Volcanoes by seven wickets at the Brian Lara Cricket Academy on Friday to move to two wins out of two this season.
The Red Force first restricted the Volcanoes to 182 all out off 45 overs after winning the toss and bowling first.
Joshua James, Yannic Cariah and Anderson Phillip all took two-wicket hauls for the Red Force while Jeremy Solozano and Sunil Ambris each made 47 for the Volcanoes.
The Red Force then needed only 38 overs to reach 186-3 and secure their second win in as many games this season.
Tion Webster led the way with the bat with 95* off 115 balls including 14 fours and one six while Amir Jangoo hit 31.
Captain Joshua Da Silva finished 21* alongside Webster.
Full Scores:
Windward Islands Volcanoes 182 off 45 overs (Sunil Ambris 47, Jeremy Solozano 47, Joshua James 2-15, Anderson Phillip 2-21, Yannic Cariah 2-35)
Trinidad & Tobago Red Force 186-3 off 38 overs (Tion Webster 95*, Amir Jangoo 31)
The Red Force will next play the Leeward Islands Hurricanes at the same venue on Sunday while the Volcanoes will next play the Jamaica Scorpions at the Queen’s Park Oval on Tuesday.
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