A lot is at stake for the clubs who will tackle some of France's finest in the last eight of European Cup competition the following weekend - Edinburgh against Toulouse at Murrayfield in the Heineken Cup and Scarlets against Brive in the Amlin.
Speaking on the players' return, head coach Michael Bradley said: "It's been great to have them back.
"They're all quality players, so the biggest benefit has been the increased competition for places in the team, which has had a knock on effect on the quality and intensity of training.
"We've been working on re-emphasising our systems with the returning players in terms of how Edinburgh Rugby play in attack and defence. These are experienced professionals, they're used to this process, and they have come through it well.
"There's so much to play for because European knockout competition is just around the corner, so I expect Scarlets will travel strong.
"That, combined with a strong Edinburgh Rugby team, should make for a great match."
Among the club's returning internationalists are prop Allan Jacobsen and winger Lee Jones who missed Scotland's final 6 Nations match through injury but have returned to full fitness for the match.
Jones' return to start at wing sees Tom Brown move to full-back while Stuart McInally is selected at number 8 with Netani Talei rested as a precaution due a slight back strain.
Edinburgh Rugby team to play Scarlets at Murrayfield Stadium tomorrow (Friday 30 March, kick-off 7.35pm):
15 Tom Brown; 14 Lee Jones, 13 Nick De Luca, 12 Matt Scott, 11 Tim Visser; 10 Greig Laidlaw CAPTAIN, 9 Mike Blair; 1 Allan Jacobsen, 2 Ross Ford, 3 Geoff Cross, 4 Grant Gilchrist, 5 Sean Cox, 6 David Denton, 7 Ross Rennie, 8 Stuart McInally
Substitutes: 16 Andrew Kelly, 17 Kyle Traynor, 18 Jack Gilding, 19 Esteban Lozada, 20 Roddy Grant, 21 Chris Leck, 22 Phil Godman, 23 Jim Thompson
Unavailable through injury: Ben Cairns (knee), Robin Hislop (thumb), John Houston (neck strain), James King (groin), Steven Lawrie (knee), Steven Turnbull (ankle)
To buy tickets go to www.edinburghrugby.org, call the ticket hotline (0131 346 5180) or visit the ticket centre in person at Murrayfield Stadium, Gate A, off Roseburn Street. The centre is open from 9am-5pm (half-time on match-day).
| Adult | Snr Citizen | Student | U18 | |
| Lower north/south | £15 (£20) | £10 (£12.50) | £5 | £5 |
| Upper north/south corner | £15 (£20) | £10 (£12.50) | £5 | £5 |
| Upper North | £20 (£25) | £10 (£12.50) | £5 (£10) | £5 |
| Upper West | £25 (£30) | £12.50 (£15) | £10 | £5 |
| Trackside Standing | Sold Out | Sold Out | Sold Out | Sold Out |
| Lower/Upper east | Sold Out | Sold Out | Sold Out | Sold Out |
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