Saturday's clash with Munster at the Kingspan Stadium promises to be a memorable occasion for Trimble and his family with the winger set to become the first player to make a double century of appearances for Ulster.

But ever the professional, Trimble refused to be distracted from matters on the pitch, with fourth-placed Ulster looking to close the gap to the top of the GUINNESS PRO12 table.

The Ulstermen have won their last four matches in all tournaments since their 8-3 reverse to Leinster at the end of November while Munster have slipped to five straight defeats in all competitions - their worst run since the 2003/2004 season.

However Trimble is well aware that you write Munster off at your peril.

"We've put ourselves under pressure, but it's always easier to win when you have momentum, but it's never easy to win against Munster, it's a side that always turns up," he said.

"I don't want to get distracted by this being my 200th game for Ulster.

"Sure, it means a lot to me, it means a lot to the team I'm sure, but it's far more important that we go out there on Saturday and perform as we have in recent games.

"Honestly, proud though I am to be playing for Ulster for the 200th time, it'll only really count if we play as well as we have been, and keep the winning momentum going."

Trimble is part of an unchanged backline from the one which helped Ulster secured a 10-3 away win over Connacht last weekend.

Rory Best will return to captain the side from hooker in one of four changes up front with director of rugby Les Kiss recalling loosehead prop Kyle McCall to the front row alongside Wiehahn Herbst, who remains at tighthead.

Chris Henry has overcome a slight shoulder injury and is selected at openside flanker, with Robbie Diack and Nick Williams retaining their places in the other back row spots.

While Rob Herring, Callum Black, Ricky Lutton, Alan O'Connor and Roger Wilson are back up for the forwards, and Paul Marshall, Ian Humphreys and Sammy Arnold again provide backline cover.

Despite their recent dip in form, Munster can take heart from the fact that they are unbeaten in their last three fixtures against Ulster including a 32-28 win at Thomond Park earlier this season.

Head coach Anthony Foley has introduced seven changes as his side go in search of their first league double over Ulster since the 2010/2011 season.

Injury has forced James Cronin out of the front row with Dave Kilcoyne coming in at loose-head while BJ Botha has recovered from flu to return to the starting line-up.

Captain CJ Stander continues at 8, Jack O'Donoghue switches to blindside and Mark Chisholm is introduced in the second row with Tommy O'Donnell returning to the backrow.

There are three changes to the backline as Ian Keatley joins Tomás O'Leary in the half-backs while Lucas Gonzalez Amorosino and Ronan O'Mahony are both introduced out wide.

Academy player Rory Scannell, who signed a two-year senior contract earlier this week, continues his midfield partnership with Francis Saili while Andrew Conway remains at fullback.

"It's everyone that wins, everyone that loses, it's now about us trying to build pressure on the opposition," said Foley.

"A big issue at the moment for us is our inability to score. We need to try and make life a little bit easier for ourselves and try and get that scoreboard ticking over.

"Tyler (Bleyendaal) missed a penalty against Dragons, Keats (Ian Keatley) missed one against Leicester, and Rory (Scannell) missed one against Leinster.

"There is no hiding away from the fact that we need to be getting those three points. That builds the scoreboard up. But they step up and miss them and we have got to then get back into the game somehow."

At Kingspan Stadium, 3pm
Live on Sky Sports

Referee: Gary Conway (IRFU, 19th competition game)
Assistant Referees: Sean Gallagher, Brian MacNeice (both IRFU)
Citing Commissioner: Eddie Wigglesworth (IRFU)
TMO: Alan Rogan (IRFU)