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Giorgios Giakoumakis marked his first start with his maiden goal as Celtic overcame stubborn St Johnstone in the Scottish Premiership to extend their winning run to four games.
The Greek striker volleyed the first-half opener following a lapse from visiting defender Callum Booth.
Celtic finally made sure of a deserved victory with Josip Juranovic's penalty.
The hosts stay fourth, a point behind leaders Hearts and Rangers, the latter facing St Mirren on Sunday.
St Johnstone's second successive defeat drops last season's cup double winners to 10th, two points above second-bottom Dundee.
Giakoumakis, a summer arrival from Dutch side VVV Venlo, was unleashed from the start after impressing in the Europa League win over Ferencvaros, his third outing off the bench.
But the 26-year-old and Celtic were superbly marshalled by St Johnstone until Booth's mistake undid all the visitors' diligent defending.
Juranovic's hopeful shot from distance took a looping deflection into the box where Booth missed his attempted clearance, allowing Anthony Ralston to square for Giakoumakis to volley past Zander Clark.
It brought relief for the hosts and dejection for St Johnstone, who had welcomed back defensive lynchpin Liam Gordon from injury for a first appearance since August.
Bar a Callum McGregor drive stopped by Clark's outstretched leg, the hosts had struggled to penetrate until Giakoumakis struck.
Kyogo Furushashi, deployed wide right to accommodate the Greek in the central strike role, was a peripheral presence while Jota on the opposite flank was Celtic's liveliest performer.
St Johnstone came out with fresh impetus after the break, Jamie McCart heading over from a corner and Cammy MacPherson slicing high and wide.
Celtic quickly reasserted control, and McGregor had a drive deflected inches wide, but the hosts were restricted to few clear-cut chances until the closing stages.
The clinching goal arrived when Jota and Kyogo combined, with the Japanese forward caught by Gordon just inside the box. Juranovic sent Clark the wrong way from the penalty spot.
Tom Rogic and McGregor had drives batted away by Clark, either side of a shot off the post by substitute Mikey Johnston, as St Johnstone avoided further damage.
More to follow.
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Celtic
Squad number15Player nameHart
Squad number56Player nameRalston
Squad number20Player nameCarter-Vickers
Squad number4Player nameStarfelt
Squad number88Player nameJuranovic
Squad number18Player nameRogic
Squad number42Player nameMcGregor
Squad number14Player nameTurnbull
Squad number8Player nameFuruhashi
Squad number7Player nameGiakoumakis
Squad number17Player nameJota
Squad number10Player nameAjeti
Squad number11Player nameAbada
Squad number19Player nameJohnston
St Johnstone
Squad number1Player nameClark
Squad number25Player nameEfe Ambrose
Squad number6Player nameGordon
Squad number4Player nameMcCart
Squad number2Player nameBrown
Squad number18Player nameMacPherson
Squad number13Player nameBryson
Squad number24Player nameBooth
Squad number14Player nameMiddleton
Squad number9Player nameKane
Squad number10Player nameWotherspoon
Squad number7Player nameMay
Squad number17Player nameVertainen
Squad number21Player nameCrawford
Line-ups
Celtic
Formation 4-3-3
- 15Hart
- 56Ralston
- 20Carter-VickersBooked at 77mins
- 4Starfelt
- 88Juranovic
- 18Rogic
- 42McGregor
- 14Turnbull
- 8FuruhashiSubstituted forAbadaat 81'minutes
- 7GiakoumakisSubstituted forJohnstonat 61'minutes
- 17Neves FilipeSubstituted forAjetiat 86'minutes
Substitutes
- 6Bitton
- 10Ajeti
- 11Abada
- 19Johnston
- 29Bain
- 54Montgomery
- 57Welsh
St Johnstone
Formation 3-4-3
- 1Clark
- 25AmbroseBooked at 79mins
- 6GordonBooked at 79mins
- 4McCart
- 2Brown
- 18MacPhersonBooked at 29mins
- 13BrysonBooked at 55mins
- 24Booth
- 14MiddletonSubstituted forCrawfordat 63'minutes
- 9KaneBooked at 77minsSubstituted forVertainenat 85'minutes
- 10WotherspoonSubstituted forMayat 70'minutes
Substitutes
- 3Devine
- 7May
- 12Parish
- 16Muller
- 17Vertainen
- 21Crawford
- 26Craig
Live Text
Match ends, Celtic 2, St. Johnstone 0.
Second Half ends, Celtic 2, St. Johnstone 0.
Attempt missed. Josip Juranovic (Celtic) left footed shot from the left side of the box misses to the right. Assisted by Tomas Rogic.
Attempt saved. Callum McGregor (Celtic) left footed shot from outside the box is saved in the top centre of the goal.
Attempt blocked. Michael Johnston (Celtic) left footed shot from the left side of the box is blocked. Assisted by Josip Juranovic.
Corner, St. Johnstone. Conceded by Cameron Carter-Vickers.
Attempt blocked. Stevie May (St. Johnstone) right footed shot from the right side of the box is blocked. Assisted by Cameron MacPherson.
Attempt missed. Liel Abada (Celtic) left footed shot from the centre of the box is too high. Assisted by Albian Ajeti.
Michael Johnston (Celtic) hits the right post with a right footed shot from the left side of the box. Assisted by David Turnbull.
Dangerous play by Carl Starfelt (Celtic).
Eetu Vertainen (St. Johnstone) wins a free kick in the defensive half.
Substitution, Celtic. Albian Ajeti replaces Jota.
Substitution, St. Johnstone. Eetu Vertainen replaces Christopher Kane.
Attempt missed. Cameron Carter-Vickers (Celtic) header from very close range misses to the right. Assisted by David Turnbull with a cross following a corner.
Corner, Celtic. Conceded by Callum Booth.
Attempt missed. Anthony Ralston (Celtic) right footed shot from the centre of the box misses to the right. Assisted by Jota with a cross following a corner.
Corner, Celtic. Conceded by Zander Clark.
Attempt saved. Michael Johnston (Celtic) right footed shot from the centre of the box is saved in the bottom right corner. Assisted by Jota.
Substitution, Celtic. Liel Abada replaces Kyogo Furuhashi.
Goal! Celtic 2, St. Johnstone 0. Josip Juranovic (Celtic) converts the penalty with a right footed shot to the bottom left corner.