They then have a five-day break before the Friends Provident Trophy game against Glamorgan (1200 BST).
Ireland have been boosted by a five-figure sponsorship deal for their five home matches in the Friends Provident Trophy.
BBC: SPORT | Cricket | Counties | Ireland | Ireland seek ICC cash injection
"It's an up-and-coming segment we want to address, " said James Tan, General Manager Asia at Friends Provident International.
He was man of the match in the Friends Provident Trophy final and scored 723 runs across all competitions.
They also won the Friends Provident Trophy at Lord's and gained promotion to Division One of the Pro40 competition.
An experiment to allow players to challenge decisions was first attempted in English county cricket's Friends Provident Trophy in 2007.
The 27-year-old featured in Sussex's Pro40 and Twenty20 Cup wins in 2009 and helped the county to the Friends Provident Trophy final.
Through some crazy scheduling, they faced the same journey back after this match to take on Sussex again in the Friends Provident Trophy tomorrow.
Throw in a Friends Provident Trophy final defeat by Essex and you have a season that perfectly encapsulates the see-saw nature of the county game.
One clear gainer in the London markets: British insurer Friends Provident.
The new branded shirts will be worn for the first time on Sunday when Ireland face Nottinghamshire in their opening Friends Provident Trophy game at Clontraf.
Of the three one-day competitions, the Friends Provident Trophy begins on 19 April with yet another change of format, now including quarter-finals after the group stage.
Schofield claimed 17 victims in this season's Twenty20 Cup, making him the leading wicket-taker in the group stage, and also took 13 in the 50-over Friends Provident Trophy.
Tredwell took 14 wickets in 14 one-day games for Kent last season and set new career-best figures of 6-27 in their Friends Provident Trophy win over Middlesex in May.
They were also beaten in the final of both the Twenty20 Cup and the Friends Provident Trophy and their captain Rob Key told BBC Radio Kent he was despondent.
In the Friends Provident Trophy, Pro 40 and Twenty20 combined, the impressively consistent Lumb has now hit 985 limited-over runs this summer, including two centuries and nine fifties in 24 innings.
Former Durham University student Smith moved to the Riverside from Nottinghamshire in 2006, since when he has helped win the 2007 Friends Provident Trophy, as well as those successive County Championship titles.
Northants are targeting success in the Friends Provident Twenty20 - which gets underway in June - as Vaas joins forces with fellow internationals Andrew Hall, Nicky Boje and Elton Chigumbura in the Steelbacks' attack.
Although Wilson was dismissed soon afterwards for 125, the crowd was treated to a brilliant display from championship debutant Roy, who signalled his potential earlier this season with a century in the Friends Provident t20.
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