An impressive trialist and a Georgie Kelly hat-trick ... on-the-whistle report: Mansfield Town 2 Rotherham United 4

The second-tier Millers already had one player - winger Sullay Kaikai - in the ranks hoping to earn a deal by impressing against League Two opposition.

They added another in an attacker they didn't identify on their team sheet but who is thought to be former Aston Villa and Sheffield Wednesday player Andre Green.

His impact was instant as he gave Rotherham a first-minute lead, thumping the ball into the roof of the net from close range after good hold up work from Georgie Kelly.

He went on to have a good game but not quite as eye-catching as the one enjoyed by Kelly who bagged a hat-trick as Rotherham stepped up the pace in the second half to cruise home.

The Millers, fielding a first-half line-up far below their strongest, were in front for only three minutes, however, as the Stags broke quickly and Stephen Quinn was at the back post to tuck away Rhys Oates' low supply from the right.

Dillon Phillips saved a shot from Lucas Akins and then a header by the same player as the home side enjoyed the better of the opening exchanges.

The rain had been in for the day was still coming down as Rotherham defended the stand housing 400-plus away supporters.

Those fans were cheering proceedings at the other end on 26 minutes as Kelly made a real nuisance of himself and then went striding in on goal to slot the ball beyond Christy Pym.

The centre-forward was clear of the calf stiffness that had seen  him miss the midweek match against Middlesbrough and led the line at the One Call Stadium.

In a 4-4-2 formation, Kaikai was on the left flank as he completed his trial period with the Millers while the second trialist started up front with Kelly.

The Millers gave up the lead again as Oates' 40th-minute back-header crept over the line despite Curtis Durose's valiant attempt to clear.

With the interval approaching, the lively second trialist crossed for Kieran McGuckin whose scorpion kick flashed wide for the visitors just before Phillips had to save well to keep out Louis Reed's fierce drive from the edge of the box.

As the teams trooped in to take respite from the weather, Rotherham were relieved to be level considering the number of opportunities the home team had created.

Nine minutes after the break, Kelly put Rotherham in the driving seat again with a real scorer's header, arching back to meet Ollie Rathbone's cross and still managing to find the accuracy to hit the bottom corner.

Three minutes later he was at it again, getting his head on Rathbone's corner to complete his treble.

The Millers were much better after the break and made a barrage of changes once the game was in the bag.

Kaikai was one of the players to go off and it may be the last time he is seen in a red-and-white shirt. The other trialist is definitely worth another look.

Mansfield (4-4-2): Christy Pym (Scott Flinders 74), Callum Johnson, Alfie Kilgour (George Cooper 74), Bailey Cargill (Aaron Lewis 53), Calum MacDonald; Hiram Boateng, Davis Keillor-Dunn, Louis Reed (Anthony Hartigan 74), Stephen Quinn (George Maris 49); Lucas Akins (Jordan Bowery 74), Rhys Oates (James Gale 81).

Rotherham (4-4-2): Dillon Phillips; Lee Peltier (Cohen Bramall 56), Sean Morrison (Tyler Blackett 64), Jamie McCart (Cameron Humphreys 64), Tolaji Bola (Hamid Seisay 74); Ciaran McGuckin (Leiwi Abraham 75), Curtis Durose (Grant Hall 74), Cafu (Ollie Rathbone H-T), Sullay Kaikai (Ben Wiles 64); Trialist (Josh Ayres 68), Georgie Kelly (Jake Hull 64). Sub not used: Viktor Johansson.

Goals: Trialist 1, Kelly 26, 54, 57 (Rotherham); Quinn 4, Oates 40 (Mansfield).

Referee: Declan Bourne (Nottinghamshire).

Attendance: 2,154 (437).